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VANGUARD CHARLOTTE FUNDS

(Exact Name of Registrant as Specified in Declaration of Trust)

P.O. Box 2600, Valley Forge, PA 19482

(Address of Principal Executive Office)

Approximate Date of Proposed Public Offering: January 17, 2012

Registrant hereby amends this Registration Statement on such date or dates as may be
necessary to delay its effective date until the Registrant shall file a further amendment
which specifically states that this Registration Statement shall thereafter become
effective in accordance with Section 8(a) of the Securities Act of 1933 or until the
Registration Statement shall become effective on such date as the Commission, acting
pursuant to Section 8(a) may determine.

The Fund seeks to track the performance of a benchmark index that measures the investment return of investment-grade bonds issued outside of the United States.

The following table describes the fees and expenses you may pay if you buy and hold Investor Shares or Admiral Shares of the Fund.

The following examples are intended to help you compare the cost of investing in the Fund’s Investor Shares or Admiral Shares with the cost of investing in other mutual funds. They illustrate the hypothetical expenses that you would incur over various periods if you invest $10,000 in the Fund’s shares. These examples assume that the Shares provide a return of 5% a year and that operating expenses remain as stated in the preceding table. The results apply whether or not you redeem your investment at the end of the given period. Although your actual costs may be higher or lower, based on these assumptions your costs would be:

The Fund has no operating history and therefore has no portfolio turnover information.

The Fund employs a “passive management”—or indexing—investment approach designed to track the performance of the Barclays Capital Global Aggregate ex-USD Float-Adjusted Index (Hedged). This Index represents the universe of global non-U.S. dollar-denominated government, government agency, corporate, and securitized investment-grade fixed-income investments, all with maturities of more than one year.

The Fund invests by sampling the Index, meaning that it holds securities that, in the aggregate, approximate the full Index in terms of key risk factors and other characteristics. At least 80% of the Fund’s assets will be invested in bonds held in the Index. The Fund maintains a dollar-weighted average maturity consistent with that of the Index, which generally ranges between 5 and 10 years.

An investment in the Fund could lose money over short or even long periods. You should expect the Fund’s share price and total return to fluctuate within a wide range, like the fluctuations of the overall bond market. The Fund’s performance could be hurt by:

• Interest rate risk, which is the chance that bond prices overall will decline because of rising interest rates. Interest rate risk should be moderate for the Fund because it invests primarily in short- and intermediate-term bonds, whose prices are less sensitive to interest rate changes than are the prices of long-term bonds.

• Income risk, which is the chance that the Fund’s income will decline because of falling interest rates. Income risk is generally moderate for intermediate-term bond funds, so investors should expect the Fund’s monthly income to fluctuate accordingly.

• Credit risk, which is the chance that a bond issuer will fail to pay interest and principal in a timely manner, or that negative perceptions of the issuer’s ability to make such payments will cause the price of that bond to decline. Credit risk should be low for the Fund because it purchases only bonds that are of investment-grade quality.

• Call risk, which is the chance that during periods of falling interest rates, issuers of callable bonds may call (redeem) securities with higher coupons or interest rates before their maturity dates. The Fund would then lose any price appreciation above the bond’s call price and would be forced to reinvest the unanticipated proceeds at lower interest rates, resulting in a decline in the Fund’s income. For mortgage-backed securities, this risk is known as prepayment risk. Call/prepayment risk should be low for the Fund because it invests only a small portion of its assets in callable bonds and mortgage-backed securities.

• Index sampling risk, which is the chance that the securities selected for the Fund, in the aggregate, will not provide investment performance matching that of the Fund’s target index. Index sampling risk for the Fund should be low.

• Country/regional risk, which is the chance that world events—such as political upheaval, financial troubles, or natural disasters—will adversely affect the value of securities issued by foreign companies, governments, or government agencies. Because the Fund may invest a large portion of its assets in securities of foreign companies, governments, or government agencies located in any one country or region, the Fund’s performance may be hurt disproportionately by the poor performance of its investments in that area. Country/regional risk for the Fund is moderate.

An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.

The Fund began operations on •, 2012, so performance information is not yet available.

Gregory Davis, CFA, Principal of Vanguard and head of Vanguard’s Bond Index Group. He has co-managed the Fund since its inception in January 2012.

Yan Pu, CFA, Portfolio Manager. She has co-managed the Fund since its inception in January 2012.

You may purchase or redeem shares online through our website (vanguard.com), by mail (The Vanguard Group, P.O. Box 1110, Valley Forge, PA 19482-1110), or by telephone (800-662-2739). The following table provides the Fund’s minimum initial and subsequent investment requirements.

The Fund’s distributions may be taxable as ordinary income or capital gain. Distributions are taxable to you for federal income tax purposes, whether or not you reinvest these amounts in additional Fund shares. A sale or exchange of Fund shares is a taxable event, which means that you may have a capital gain to report as income, or a capital loss to report as a deduction, when you complete your federal income tax return. Dividend and capital gains distributions that you receive, as well as your gains or losses from any sale or exchange of Fund shares, may also be subject to state and local income taxes.

The Fund and its investment advisor do not pay financial intermediaries for sales of Fund shares.

The Fund seeks to track the performance of a benchmark index that measures the investment return of U.S. dollar-denominated bonds issued by governments of emerging market countries.

The following table describes the fees and expenses you may pay if you buy and hold Investor Shares or Admiral Shares of the Fund.

The Fund has no operating history and therefore has no portfolio turnover information.

The Fund employs a “passive management”—or indexing—investment approach designed to track the performance of the Barclays Capital Emerging Markets Sovereign Index (USD). This Index includes U.S. dollar-denominated emerging market government bonds that have maturities longer than one year.

The Fund invests by sampling the Index, meaning that it holds a range of securities that, in the aggregate, approximates the full Index in terms of key risk factors and other characteristics. At least 80% of the Fund’s assets will be invested in bonds held in the Index. The Fund maintains a dollar-weighted average maturity consistent with that of the Index, which generally ranges between 10 and 15 years.

• Interest rate risk, which is the chance that bond prices overall will decline because of rising interest rates. Interest rate risk should be moderate for the Fund because it invests primarily in intermediate-term bonds, whose prices are less sensitive to interest rate changes than are the prices of long-term bonds.

• Income risk, which is the chance that the Fund’s income will decline because of falling interest rates. Income risk should be moderate for the Fund, so investors should expect the Fund’s monthly income to fluctuate accordingly.

• Credit risk, which is the chance that a bond issuer will fail to pay interest and principal in a timely manner, or that negative perceptions of the issuer’s ability to make such payments will cause the price of that bond to decline. Credit risk should be moderate for the Fund because it purchases investment-grade and high-yield bonds.

• Emerging markets risk, which is the chance that the bonds of governments located in emerging markets will be substantially more volatile, and substantially less liquid, than the bonds of governments located in more developed foreign markets.

• Country/regional risk, which is the chance that world events—such as political upheaval, financial troubles, or natural disasters—will adversely affect the value of securities issued by foreign governments. Because the Fund may invest a large portion of its assets in securities of foreign governments located in any one country or region, the Fund’s performance may be hurt disproportionately by the poor performance of its investments in that area. Country/regional risk is especially high in emerging markets.

An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.

The Fund began operations on •, 2012, so performance information is not yet available.

Gregory Davis, CFA, Principal of Vanguard and head of Vanguard’s Bond Index Group. He has co-managed the Fund since its inception in January 2012.

Yan Pu, CFA, Portfolio Manager. She has co-managed the Fund since its inception in January 2012.

The Fund and its investment advisor do not pay financial intermediaries for sales of Fund shares.

Indexing is an investment strategy for tracking the performance of a specified market benchmark, or “index.” An index is an unmanaged group of securities whose overall performance is used as a standard to measure the investment performance of a particular market. There are many types of indexes. Some represent entire markets—such as the U.S. stock market or the U.S. bond market. Other indexes cover market segments—such as small-capitalization stocks or short-term bonds.

An index fund holds all, or a representative sample, of the securities that make up its target index. Index funds attempt to mirror the performance of the target index, for better or worse. However, an index fund generally does not perform exactly like its target index. For example, like all mutual funds, index funds have operating expenses and transaction costs. Market indexes do not, and therefore will usually have a slight performance advantage over funds that track them.

• Variety of investments. Most Vanguard index funds generally invest in the securities of a wide variety of companies and industries.

• Relative performance consistency. Because they seek to track market benchmarks, index funds usually do not perform dramatically better or worse than their benchmarks.

• Low cost. Index funds are inexpensive to run compared with actively managed funds. They have low or no research costs and typically keep trading activity—and thus dealer markups and other transaction costs—to a minimum.

This prospectus describes the primary risks you would face as a Fund shareholder. It is important to keep in mind one of the main axioms of investing: The higher the risk of losing money, the higher the potential reward. The reverse, also, is generally true: The lower the risk, the lower the potential reward. As you consider an investment in any mutual fund, you should take into account your personal tolerance for fluctuations in the securities markets. Look for this symbol throughout the prospectus. It is used to mark detailed information about the more significant risks that you would confront as a Fund shareholder. To highlight terms and concepts important to mutual fund investors, we have provided Plain Talk^®explanations along the way. Reading the prospectus will help you decide whether a Fund is the right investment for you. We suggest that you keep this prospectus for future reference.

This prospectus offers the Funds’ Investor Shares and Admiral Shares. A separate prospectus offers the Funds’ Institutional Shares, which are generally for investors who invest a minimum of $5 million. In addition, each Fund issues an exchange-traded class of shares (ETF Shares), which are also offered through a separate prospectus.

All share classes offered by a Fund have the same investment objective, strategies, and policies. However, different share classes have different expenses; as a result, their investment performances will differ.

The following sections explain the primary investment strategies and policies that each Fund uses in pursuit of its objective. The Fund’s board of trustees, which oversees the Fund’s management, may change investment strategies or policies in the interest of shareholders without a shareholder vote, unless those strategies or policies are designated as fundamental. Each Fund’s policy of investing at least 80% of its assets in securities that are held in its target index may be changed only upon 60 days’ notice to shareholders. Note that each Fund’s investment objective is not fundamental and may be changed without a shareholder vote.

Each Fund is subject to interest rate risk, which is the chance that bond prices overall will decline because of rising interest rates. Interest rate risk should be moderate for the Funds because they invest primarily in short- and intermediate-term bonds, whose prices are less sensitive to interest rate changes than the prices of long-term bonds.

Although bonds are often thought to be less risky than stocks, there have been periods when bond prices have fallen significantly because of rising interest rates. For instance, prices of long-term bonds fell by almost 48% between December 1976 and September 1981.

To illustrate the relationship between bond prices and interest rates, the following table shows the effect of a 1% and a 2% change (both up and down) in interest rates on the values of three noncallable bonds of different maturities, each with a face value of $1,000.

These figures are for illustration only; you should not regard them as an indication of future performance of the bond market as a whole or the Funds in particular.

Plain Talk About Bonds and Interest Rates

As a rule, when interest rates rise, bond prices fall. The opposite is also true:

Bond prices go up when interest rates fall. Why do bond prices and interest rates

move in opposite directions? Let’s assume that you hold a bond offering a 4%

yield. A year later, interest rates are on the rise and bonds of comparable quality

and maturity are offered with a 5% yield. With higher-yielding bonds available,

you would have trouble selling your 4% bond for the price you paid—you would

probably have to lower your asking price. On the other hand, if interest rates were

falling and 3% bonds were being offered, you should be able to sell your 4%

bond for more than you paid.

How mortgage-backed securities are different: In general, declining interest rates

will not lift the prices of mortgage-backed securities—such as GNMAs—as much

as the prices of comparable bonds. Why? Because when interest rates fall, the

bond market tends to discount the prices of mortgage-backed securities for

prepayment risk—the possibility that homeowners will refinance their mortgages

at lower rates and cause the bonds to be paid off prior to maturity. In part to

compensate for this prepayment possibility, mortgage-backed securities tend to

offer higher yields than other bonds of comparable credit quality and maturity.

Each Fund is subject to income risk, which is the chance that the Fund’s income will decline because of falling interest rates. A fund’s income declines when interest rates fall because the fund then must invest in lower-yielding bonds. Income risk is generally moderate for the Funds because they invest primarily in short- and intermediate-term bonds.

Although falling interest rates tend to strengthen bond prices, they can cause other sorts of problems for bond fund investors—bond calls and prepayments.

Each Fund is subject to call risk, which is the chance that during periods of falling interest rates, issuers of callable bonds may call (redeem) securities with higher coupons or interest rates before their maturity dates. The Fund would then lose any price appreciation above the bond’s call price and would be forced to reinvest the unanticipated proceeds at lower interest rates, resulting in a decline in the Fund’s income. For mortgage-backed securities, this risk is known as prepayment risk.

Because each Fund invests only a small portion of its assets in callable bonds and mortgage-backed securities, call/prepayment risk should be low for each Fund.

Each Fund is subject to credit risk, which is the chance that a bond issuer will fail to pay interest and principal in a timely manner, or that negative perceptions of the issuer’s ability to make such payments will cause the price of that bond to decline.

Although the Total International Bond Index Fund purchases only investment-grade bonds, a bond held by the Fund may be downgraded, causing the Fund to hold securities below investment-grade. If a bond is downgraded below investment-grade, the Fund will generally attempt to sell the bond within a reasonable period of time. If the Fund determines that the bond cannot be sold at a reasonable price, the Fund may hold the bond until a reasonable price for the bond may be obtained.

The Emerging Markets Government Bond Index Fund purchases both investment-grade and below investment-grade bonds. Therefore, its credit risk is higher than that of the Total International Bond Index Fund.

Each Fund is subject to country/regional risk. Country/regional risk is the chance that world events—such as political upheaval, financial troubles, or natural disasters—will adversely affect the value of securities issued by foreign companies, governments, or government agencies. Because the Fund may invest a large portion of its assets in securities of foreign companies, governments, or government agencies located in any one country or region, the Fund’s performance may be hurt disproportionately by the poor performance of its investments in that area. Country/regional risk is especially high in emerging markets.

The Emerging Markets Government Bond Index Fund is subject to emerging markets risk, which is the chance that the bonds of governments located in emerging markets will be substantially more volatile, and substantially less liquid, than the bonds of governments located in more developed foreign markets.

The Total International Bond Index Fund is subject to currency risk. Currency risk is the chance that currency hedging transactions may not perfectly hedge and may eliminate any chance for a fund to benefit from favorable fluctuations in relevant foreign currencies.

The Total International Bond Index Fund is subject to counterparty risk. Counterparty risk is the chance that a counterparty to a derivative contract with the Fund is unable or unwilling to meets its financial obligations.

To a limited extent, the Total International Bond Index Fund is also exposed to event risk, which is the chance that corporate fixed income securities held by the Fund may suffer a substantial decline in credit quality and market value because of a restructuring of the companies that issued the securities, or because of other factors negatively affecting the issuers.

The following summary table is provided to help you distinguish between the Funds and their various risks.

Index sampling strategy. Because it would be very expensive and inefficient to buy and sell all bonds held in their target indexes—which is an indexing strategy called “replication”— each Fund uses index “sampling” techniques to select securities. Using sophisticated computer programs, each Fund’s advisor generally selects a representative sample of securities that approximates the full target index in terms of key risk factors and other characteristics. These factors include duration, cash flow, quality, and callability of the underlying bonds. In addition, each Fund keeps industry sector and subsector exposure within tight boundaries relative to its target index. Because the Funds do not hold all the securities in their target indexes, some of the securities (and issuers) that are held will likely be overweighted (or underweighted) compared with the target indexes.

Each Fund is subject to index sampling risk, which is the chance that the securities selected for a Fund, in the aggregate, will not provide investment performance matching that of the Fund’s target index. Index sampling risk for each Fund should be low.

The following table shows the number of bonds in each Fund’s target index, as of •.

Types of bonds. The Total International Bond Index Fund tracks the Barclays Capital Global Aggregate ex-USD Float-Adjusted Index (Hedged), which represents the universe of global non-U.S. dollar-denominated public, taxable, investment-grade, fixed income securities—including government and corporate, as well as mortgage-backed and asset-backed, securities—all with maturities of more than one year. The

Emerging Markets Government Bond Index Fund tracks the Barclays Capital Emerging Markets Sovereign Index (USD), which includes U.S. dollar-denominated emerging market government bonds with maturities of more than one year.

• Local currency bonds are denominated in a country’s local currency and issued by foreign governments, government agencies, and companies. To the extent that a Fund owns foreign bonds, it is subject to country/regional risk, which is the chance that world events—such as political upheaval, financial troubles, or natural disasters—will adversely affect the value of securities issued by governments, government agencies, and companies in foreign countries. In addition, the prices of foreign bonds and the prices of U.S. bonds have, at times, moved in opposite directions. Because the bond’s value is designated in the currency of the issuer’s country rather than in U.S. dollars, the investor is exposed to currency risk. For a hedged portfolio, currency risk should be low.

• International dollar-denominated bonds are bonds denominated in U.S. dollars and issued by foreign governments, government agencies, and companies. To the extent that a Fund owns foreign bonds, it is subject to country risk, which is the chance that world events—such as political upheaval, financial troubles, or natural disasters—will adversely affect the value of securities issued by governments, government agencies, and companies in foreign countries. In addition, the prices of foreign bonds and the prices of U.S. bonds have, at times, moved in opposite directions. Because the bond’s value is designated in dollars rather than in the currency of the issuer’s country, the investor is not exposed to currency risk; rather, the issuer assumes the risk, usually to attract U.S. investors.

• Corporate bonds (non-U.S. issuers) are IOUs issued by businesses that want to borrow money for some purpose—often to develop a new product or service, to expand into a new market, or to buy another company. As with other types of bonds, the issuer promises to repay the principal on a specific date and to make interest payments in the meantime. The amount of interest offered depends both on market conditions and on the financial health of the corporation issuing the bonds; a company whose credit rating is not strong will have to offer a higher interest rate to obtain buyers for its bonds. Corporate bonds include securities that are backed by a pool of underlying assets (asset-backed securities) or commercial mortgages (commercial mortgage-backed bonds). The Total International Bond Index Fund expects to purchase only investment-grade corporate bonds.

• Mortgage-backed securities represent interests in underlying pools of mortgages.

Unlike ordinary bonds, which generally pay a fixed rate of interest at regular intervals and then repay principal upon maturity, mortgage-backed securities pass through both interest and principal from underlying mortgages as part of their regular payments.

Because the mortgages underlying the securities can be prepaid at any time by homeowners or by corporate borrowers, mortgage-backed securities are subject to prepayment risk.

Each Fund will invest at least 80% of its assets in bonds held in its target index. Up to 30% of each Fund’s assets may be used to purchase nonpublic, investment-grade securities, generally referred to as 144A securities, as well as smaller public issues or medium-term notes not included in the index because of the small size of the issue. The vast majority of these securities will have characteristics and risks similar to those in the target indexes. Subject to a 20% limit, the Funds may also purchase other investments that are outside of their target indexes or may hold bonds that, when acquired, were included in the index but subsequently were removed.

Each Fund reserves the right to substitute a different index for the index it currently tracks if the current index is discontinued, if the Fund’s agreement with the sponsor of its target index is terminated, or for any other reason determined in good faith by the Fund’s board of trustees. In any such instance, the substitute index would measure the same general market segment as the current index.

Each Fund may invest in derivatives. In general, derivatives may involve risks different from, and possibly greater than, those of the underlying securities, assets, or market indexes.

Generally speaking, a derivative is a financial contract whose value is based on the value of a financial asset (such as a stock, bond, or currency), a physical asset (such as gold, oil, or wheat), or a market index (such as the Barclays Capital U.S. Aggregate Bond Index). A Fund may invest in derivatives only if the expected risks and rewards of the derivatives are consistent with the investment objective, policies, strategies, and risks of the Fund as disclosed in this prospectus. The advisor will not use derivatives to change the risk exposure of the Fund. In particular, derivatives will be used only when they may help the advisor:

• Invest in eligible asset classes with greater efficiency and lower cost than is possible through direct investment;

• In the case of the Total International Bond Index Fund, hedge currency risk.

The Funds‘ derivative investments may include fixed income futures contracts, fixed income options, interest rate swaps, total return swaps, credit default swaps, or other derivatives. Losses (or gains) involving futures contracts can sometimes be substantial—in part because a relatively small price movement in a futures contract

may result in an immediate and substantial loss (or gain) for a fund. Similar risks exist for other types of derivatives.

Vanguard may invest a small portion of each Fund’s assets in shares of bond exchange-traded funds (ETFs). ETFs provide returns similar to those of the bonds listed in the index or in a subset of the index. Vanguard may purchase ETFs when doing so will reduce the Fund’s transaction costs or add value because the instruments are favorably priced. Vanguard receives no additional revenue from investing Fund assets in ETF Shares of other Vanguard funds. Fund assets invested in ETF Shares are excluded when allocating to the Fund its share of the costs of Vanguard operations.

Each Fund’s daily cash balance may be invested in one or more Vanguard CMT Funds, which are very low-cost money market funds. When investing in a Vanguard CMT Fund, each Fund bears its proportionate share of the at-cost expenses of the CMT Fund in which it invests.

Each Fund may temporarily depart from its normal investment policies and strategies when doing so is believed to be in the Fund’s best interest, so long as the alternative is consistent with the Fund’s investment objective. For instance, the Fund may invest beyond the normal limits in derivatives or ETFs that are consistent with the Fund’s objective when those instruments are more favorably priced or provide needed liquidity, as might be the case when the Fund receives large cash flows that it cannot prudently invest immediately.

Vanguard fund. Purchases that result from reinvested dividend or capital gains distributions are not subject to the purchase fees. In addition, the Funds each charge a 2% redemption fee on shares redeemed before they have been held for two months. The fee applies if you redeem shares by selling or by exchanging to another Vanguard fund, or if Vanguard liquidates your Fund account because the balance falls below the minimum initial investment for any reason, including market fluctuation. Shares you have held the longest will be redeemed first.

Unlike a sales charge or a load paid to a broker or a fund management company, purchase and redemption fees are paid directly to the Fund to offset the costs of buying and selling securities. The 2% redemption fee is designed to ensure that short-term investors pay their share of the Fund’s transaction costs and that long-term investors do not subsidize the activities of short-term traders.

An account service fee of $20 per year applies to certain fund accounts whose balances are less than $10,000.

Background. Some investors try to profit from strategies involving frequent trading of mutual fund shares, such as market-timing. For funds holding foreign securities, investors may try to take advantage of an anticipated difference between the price of the fund’s shares and price movements in overseas markets, a practice also known as time-zone arbitrage. Investors also may try to engage in frequent trading of funds holding investments such as small-cap stocks and high-yield bonds. As money is shifted into and out of a fund by a shareholder engaging in frequent trading, a fund incurs costs for buying and selling securities, resulting in increased brokerage and administrative costs. These costs are borne by all fund shareholders, including the long-term investors who do not generate the costs. In addition, frequent trading may interfere with an advisor’s ability to efficiently manage the fund.

Policies to Address Frequent Trading. The Vanguard funds (other than money market funds and short-term bond funds) do not knowingly accommodate frequent trading. Vanguard ETF^®Shares are not subject to these frequent-trading policies, although the brokerage firm through which ETF Shares are held may place certain limits on the ability to purchase and/or sell ETF Shares over any given period. The board of trustees of each Vanguard fund has adopted policies and procedures reasonably designed to detect and discourage frequent trading and, in some cases, to compensate the fund for the costs associated with it. Although there is no assurance that Vanguard will be able to detect or prevent frequent trading or market-timing in all circumstances, the following policies have been adopted to address these issues:

• Each Vanguard fund reserves the right to reject any purchase request—including exchanges from other Vanguard funds—without notice and regardless of size. For example, a purchase request could be rejected because of a history of frequent trading by the investor or if Vanguard determines that such purchase may negatively affect a fund’s operation or performance.

• Each Vanguard fund (other than money market funds and short-term bond funds) generally prohibits, except as otherwise noted in the Investing With Vanguard section, an investor’s purchases or exchanges into a fund account for 60 calendar days after the investor has redeemed or exchanged out of that fund account.

• Certain Vanguard funds charge shareholders purchase and/or redemption fees on transactions.

See the Investing With Vanguard section of this prospectus for further details on Vanguard’s transaction policies.

Each fund (other than money market funds), in determining its net asset value, will, when appropriate, use fair-value pricing, as described in the Share Price section. Fair-value pricing may reduce or eliminate the profitability of certain frequent-trading strategies.

Although the Funds generally seek to invest for the long term, each Fund may sell securities regardless of how long they have been held. Generally, an index fund sells securities in response to redemption requests or to changes in the composition of a target index, or to manage the fund’s duration.

with administrative services and business operations, such as personnel, office space, equipment, and advertising.

Vanguard also provides marketing services to the funds. Although shareholders do not pay sales commissions or 12b-1 distribution fees, each fund (other than a fund of funds) or each share class of a fund (in the case of a fund with multiple share classes) pays its allocated share of The Vanguard Group’s marketing costs.

The Vanguard Group, Inc. (Vanguard), P.O. Box 2600, Valley Forge, PA 19482, which began operations in 1975, serves as advisor to the Funds through its Fixed Income Group. As of •, Vanguard served as advisor for approximately $• trillion in assets. Vanguard manages the Funds on an at-cost basis, subject to the supervision and oversight of the trustees and officers of the Funds.

For a discussion of why the board of trustees approved each Fund’s investment advisory arrangement, see the semiannual report to shareholders covering the fiscal period ended April 30, 2012, which will be available 60 days after that date.

George U. Sauter, Chief Investment Officer and Managing Director of Vanguard. As Chief Investment Officer, he is responsible for the oversight of Vanguard’s Quantitative Equity and Fixed Income Groups. The investments managed by these two groups include active quantitative equity funds, equity index funds, active bond funds, index bond funds, stable value portfolios, and money market funds. Since joining Vanguard in 1987, Mr. Sauter has been a key contributor to the development of Vanguard’s stock indexing and active quantitative equity investment strategies. He received his A.B. in Economics from Dartmouth College and an M.B.A. in Finance from the University of Chicago.

Robert F. Auwaerter, Principal of Vanguard and head of Vanguard’s Fixed Income Group. He has direct oversight responsibility for all money market funds, bond funds, and stable value portfolios managed by the Fixed Income Group. He has managed investment portfolios since 1978 and has been with Vanguard since 1981. He received his B.S. in Finance from The Wharton School of the University of Pennsylvania and an M.B.A. from Northwestern University.

Kenneth E. Volpert, CFA, Principal of Vanguard and head of Vanguard’s Taxable Bond Group. He has direct oversight responsibility for all taxable bond funds managed by the Fixed Income Group. He has managed investment portfolios since 1982 and has been with Vanguard since 1992. He received his B.S. from the University of Illinois and an M.B.A. from the University of Chicago.

The managers primarily responsible for the day-to-day management of the Funds are:

Gregory Davis, CFA, Principal of Vanguard and head of Vanguard’s Bond Index Group. He has worked in investment management for Vanguard since 1999; has managed investment portfolios since 2000; and has co-managed the Funds since their inceptions in January 2012. Education: B.S., The Pennsylvania State University; M.B.A., The Wharton School of the University of Pennsylvania.

Yan Pu, CFA, Portfolio Manager. She has worked in investment management for Vanguard since 2004; has managed investment portfolios since 2007; and has co-managed the Funds since their inceptions in January 2012. Education: B.S, JiNan University; MBA, Drexel University.

The Statement of Additional Information provides information about each portfolio manager’s compensation, other accounts under management, and ownership of shares of the Funds.

Each Fund distributes to shareholders virtually all of its net income (interest less expenses) as well as any net capital gains realized from the sale of its holdings. The Fund’s income dividends are declared • and distributed •; capital gains distributions generally occur annually in •. You can receive distributions of income or capital gains in cash, or you can have them automatically reinvested in more shares of the Fund.

Vanguard will send you a statement each year showing the tax status of all your distributions. In addition, investors in taxable accounts should be aware of the following basic federal income tax points:

• Distributions are taxable to you whether or not you reinvest these amounts in additional Fund shares.

• Distributions declared in December—if paid to you by the end of January—are taxable as if received in December.

• Any dividend or short-term capital gains distributions that you receive are taxable to you as ordinary income.

• Any distributions of net long-term capital gains are taxable to you as long-term capital gains, no matter how long you’ve owned shares in the Fund.

• Capital gains distributions may vary considerably from year to year as a result of the Funds‘ normal investment activities and cash flows.

• A sale or exchange of Fund shares is a taxable event. This means that you may have a capital gain to report as income, or a capital loss to report as a deduction, when you complete your tax return.

• Any conversion between classes of shares of the same fund is a nontaxable event. By contrast, an exchange between classes of shares of different funds is a taxable event.

Dividend and capital gains distributions that you receive, as well as your gains or losses from any sale or exchange of Fund shares, may be subject to state and local income taxes.

The Funds may be subject to foreign taxes or foreign tax withholding on dividends, interest, and some capital gains that the Fund receives on foreign securities. You may qualify for an offsetting credit or deduction under U.S. tax laws for any amount designated as your portion of the Fund’s foreign tax obligations, provided that you meet certain requirements. See your tax advisor or IRS publications for more information.

This prospectus provides general tax information only. If you are investing through a tax-deferred retirement account, such as an IRA, special tax rules apply. Please consult your tax advisor for detailed information about any tax consequences for you.

Backup withholding. By law, Vanguard must withhold 28% of any taxable distributions or redemptions from your account if you do not:

Similarly, Vanguard must withhold taxes from your account if the IRS instructs us to do so.

Foreign investors. Vanguard’s SEC-registered funds, including the Funds offered in this prospectus, generally are not sold outside the United States, except to certain qualified investors. Non-U.S. investors should be aware that U.S. withholding and estate taxes may apply to any investments in Vanguard funds. Foreign investors should visit the “Non-U.S. Investors” page on our website at vanguard.com for information on Vanguard’s non-U.S. products.

Invalid addresses. If a dividend or capital gains distribution check mailed to your address of record is returned as undeliverable, Vanguard will automatically reinvest the distribution and all future distributions until you provide us with a valid mailing address. Reinvestments will receive the net asset value calculated on the date of the reinvestment.

Share price, also known as net asset value (NAV), is calculated each business day as of the close of regular trading on the New York Stock Exchange, generally 4 p.m., Eastern time. Each share class has its own NAV, which is computed by dividing the total assets, minus liabilities, allocated to each share class by the number of Fund shares outstanding for that class. On holidays or other days when the Exchange is closed, the NAV is not calculated, and the Funds do not transact purchase or redemption requests. However, on those days the value of the Funds’ assets may be affected to the extent that the Funds hold foreign securities that trade on foreign markets that are open.

Debt securities held by a Vanguard fund are valued based on information furnished by an independent pricing service or market quotations. Certain short-term debt instruments used to manage a fund’s cash are valued on the basis of amortized cost. The values of any mutual fund shares held by a fund are based on the NAVs of the

shares. The values of any ETF or closed-end fund shares held by a fund are based on the market value of the shares.

When a fund determines that pricing-service information or market quotations either are not readily available or do not accurately reflect the value of a security, the security is priced at its fair value (the amount that the owner might reasonably expect to receive upon the current sale of the security). Additionally, a fund also will use fair-value pricing if the value of a security it holds has been materially affected by events occurring before the fund’s pricing time but after the close of the primary markets or exchanges on which the security is traded. This most commonly occurs with foreign securities, which may trade on foreign exchanges or markets that close many hours before the fund’s pricing time. Intervening events might be: company-specific (e.g., earnings report, merger announcement), or country-specific or regional/global (e.g., natural disaster, economic or political news, act of terrorism, interest rate change). Intervening events include price movements in U.S. markets that are deemed to affect the value of foreign securities.

Fair-value prices are determined by Vanguard according to procedures adopted by the board of trustees. When fair-value pricing is employed, the prices of securities used by a fund to calculate the NAV may differ from quoted or published prices for the same securities.

Vanguard fund share prices are published daily on our website at vanguard.com/prices.

This section of the prospectus explains the basics of doing business with Vanguard. Be sure to carefully read each topic that pertains to your relationship with Vanguard. Vanguard reserves the right to change the following policies, without notice to shareholders. Please call or check online for current information.

Each fund you hold in an account is a separate “fund account.” For example, if you hold three funds in a nonretirement account titled in your own name, two funds in a nonretirement account titled jointly with your spouse, and one fund in an individual retirement account, you have six fund accounts—and this is true even if you hold the same fund in multiple accounts. Note that each reference to “you” in this prospectus applies to any one or more registered account owners.

Vanguard reserves the right, without notice, to increase or decrease the minimum amount required to open, convert shares to, or maintain a fund account, or to add to an existing fund account.

Add to an existing account. $100 (other than by Automatic Investment Plan, which has no established minimum).

To open and maintain an account. $10,000. If you request Admiral Shares when you open a new account, but the investment amount does not meet the account minimum for Admiral Shares, your investment will be placed in Investor Shares of the Fund. Institutional clients should contact Vanguard for information on special eligibility rules that may apply to them.

Add to an existing account. $100 (other than by Automatic Investment Plan, which has no established minimum).

Be sure to check Exchanging Shares, Frequent-Trading Policy, and Other Rules You Should Know before placing your purchase request.

Online. You may open certain types of accounts, request a purchase of shares, and request an exchange (the purchase of shares of one Vanguard fund using the

proceeds of a simultaneous redemption of shares of another Vanguard fund) through our website at vanguard.com if you are a registered user.

By telephone. You may call Vanguard to begin the account registration process or request that the account-opening forms be sent to you. You may also call Vanguard to request a purchase of shares in your account. See Contacting Vanguard.

By mail. You may send Vanguard your account registration form and check to open a new fund account. To add to an existing fund account, you may send your check with an Invest-by-Mail form (from your account statement), with a deposit slip (available online), or with a written request. You may also send a written request to Vanguard to make an exchange. For a list of Vanguard addresses, see Contacting Vanguard.

By electronic bank transfer. You may purchase shares of a Vanguard fund through an electronic transfer of money from a bank account. To establish the electronic bank transfer option on an account, you must designate the bank account online, complete a special form, or fill out the appropriate section of your account registration form. After the option is set up on your account, you can purchase shares by electronic bank transfer on a regular schedule (Automatic Investment Plan) or from time to time. Your purchase request can be initiated online (if you are a registered user of vanguard.com), by telephone, or by mail.

By wire. Wiring instructions vary for different types of purchases. Please call Vanguard for instructions and policies on purchasing shares by wire. See Contacting Vanguard.

By check. You may send a check to make initial or additional purchases to your fund account. Also see How to Initiate a Purchase Request: By mail. Make your check payable to Vanguard and include the appropriate fund number (e.g., Vanguard—xx). For a list of Fund numbers (for Funds and share classes in this prospectus), see

By exchange. You may purchase shares of a Vanguard fund using the proceeds from the simultaneous redemption of shares of another Vanguard fund. You may initiate an exchange online (if you are a registered user of vanguard.com), by telephone, or by mail. See Exchanging Shares.

The trade date for any purchase request received in good order will depend on the day and time Vanguard receives your request, the manner in which you are paying, and the type of fund you are purchasing. Your purchase will be executed using the NAV as calculated on the trade date. NAVs are calculated only on days that the New York Stock Exchange (NYSE) is open for trading (a business day).

For purchases by check into all funds other than money market funds, and for purchases by exchange or wire into all funds: If the purchase request is received by Vanguard on a business day before the close of regular trading on the NYSE (generally 4 p.m., Eastern time), the trade date will be the same day. If the purchase request is received on a business day after the close of regular trading on the NYSE, or on a nonbusiness day, the trade date will be the next business day.

For purchases by check into money market funds: If the purchase request is received by Vanguard on a business day before the close of regular trading on the NYSE (generally 4 p.m., Eastern time), the trade date will be the next business day. If the purchase request is received on a business day after the close of regular trading on the NYSE, or on a nonbusiness day, the trade date will be the second business day following the day Vanguard receives the purchase request. Because money market instruments must be purchased with federal funds and it takes a money market mutual fund one business day to convert check proceeds into federal funds, the trade date will be one business day later than for other funds.

For purchases by electronic bank transfer using an Automatic Investment Plan: Your trade date generally will be one business day before the date you designated for withdrawal from your bank account.

For purchases by electronic bank transfer not using an Automatic Investment Plan: If the purchase request is received by Vanguard on a business day before 10 p.m., Eastern time, the trade date generally will be the next business day. If the purchase request is received on a business day after 10 p.m., Eastern time, or on a nonbusiness day, the trade date will be the second business day following the day Vanguard receives the request.

If your purchase request is not accurate and complete, it may be rejected. See Other Rules You Should Know—Good Order.

For further information about purchase transactions, consult our website at vanguard.com or see Contacting Vanguard.

The Funds charge purchase fees of 0.25% (for the Total International Bond Index Fund) and 0.75% (for the Emerging Markets Government Bond Index Fund) on all share purchases, including shares purchased by exchange from another Vanguard fund. Purchase fees do not apply to shares purchased through reinvested dividends or capital gains.

You generally begin earning dividends on the business day following your trade date.

• Other retirement plan accounts receiving special administrative services from Vanguard.

Check purchases. All purchase checks must be written in U.S. dollars and must be drawn on a U.S. bank. Vanguard does not accept cash, traveler’s checks, or money orders. In addition, Vanguard may refuse “starter checks” and checks that are not made payable to Vanguard.

New accounts. We are required by law to obtain from you certain personal information that we will use to verify your identity. If you do not provide the information, we may not be able to open your account. If we are unable to verify your identity, Vanguard reserves the right, without notice, to close your account or take such other steps as we deem reasonable.

Refused or rejected purchase requests. Vanguard reserves the right to stop selling fund shares or to reject any purchase request at any time and without notice, including, but not limited to, purchases requested by exchange from another Vanguard fund. This also includes the right to reject any purchase request because of a history of frequent trading by the investor or because the purchase may negatively affect a fund’s operation or performance.

Large purchases. Please call Vanguard before attempting to invest a large dollar amount.

No cancellations. Vanguard will not accept your request to cancel any purchase request once processing has begun. Please be careful when placing a purchase request.

When a conversion occurs, you receive shares of one class in place of shares of another class of the same fund. At the time of conversion, the dollar value of the “new” shares you receive equals the dollar value of the “old” shares that were converted. In other words, the conversion has no effect on the value of your investment in the fund at the time of the conversion. However, the number of shares you own after the conversion may be greater than or less than the number of shares you owned before the conversion, depending on the net asset values of the two share classes.

The trade date for any conversion request received in good order will depend on the day and time Vanguard receives your request. Your conversion will be executed using the NAVs of the different share classes on the trade date. NAVs are calculated only on days that the NYSE is open for trading (a business day).

For a conversion request received by Vanguard on a business day before the close of regular trading on the NYSE (generally 4 p.m., Eastern time), the trade date will be the same day. For a conversion request received on a business day after the close of regular trading on the NYSE, or on a nonbusiness day, the trade date will be the next business day. See Other Rules You Should Know.

Self-directed conversions. If your account balance in the Fund is at least $10,000, you may ask Vanguard to convert your Investor Shares to Admiral Shares. You can request a conversion online (if you are a registered user of vanguard.com), by telephone, or by mail. Institutional clients should contact Vanguard for information on special eligibility rules that may apply to them. See Contacting Vanguard.

Automatic conversions. Vanguard conducts periodic reviews of account balances and may, if your account balance in the Fund exceeds $10,000, automatically convert your Investor Shares to Admiral Shares. You will be notified before an automatic conversion occurs and will have an opportunity to instruct Vanguard not to effect the conversion. Institutional clients should contact Vanguard for information on special eligibility rules that may apply to them.

You are eligible for a self-directed conversion from another share class to Institutional Shares of the same Fund (if available), provided that your account meets all eligibility requirements. Registered users of our website, vanguard.com, may request a conversion online, or you may contact Vanguard by telephone or by mail to request this transaction. Accounts that qualify for Institutional Shares will not be automatically converted.

If an account no longer meets the balance requirements for a share class, Vanguard may automatically convert the shares in the account to another share class, as appropriate. A decline in the account balance because of market movement may result in such a conversion. Vanguard will notify the investor in writing before any mandatory conversion occurs.

Be sure to check Exchanging Shares, Frequent-Trading Policy, and Other Rules You Should Know before placing your redemption request.

Online. You may request a redemption of shares and request an exchange (using the proceeds from the redemption of shares of one Vanguard fund to simultaneously purchase shares of a different Vanguard fund) through our website at vanguard.com if you are a registered user.

By mail. You may send a written request to Vanguard to redeem from a fund account or to make an exchange. See Contacting Vanguard.

By electronic bank transfer. You may have the proceeds of a fund redemption sent directly to a designated bank account. To establish the electronic bank transfer option on an account, you must designate a bank account online, complete a special form, or fill out the appropriate section of your account registration form. After the option is set up on your account, you can redeem shares by electronic bank transfer on a regular schedule (Automatic Withdrawal Plan) or from time to time. Your redemption request can be initiated online, by telephone, or by mail.

By wire. When redeeming from a money market fund or a bond fund, you may instruct Vanguard to wire your redemption proceeds ($1,000 minimum) to a previously designated bank account. Wire redemptions generally are not available for Vanguard’s balanced or stock funds. To establish the wire redemption option, you generally must designate a bank account online, complete a special form, or fill out the appropriate section of your account registration form.

By exchange. You may have the proceeds of a Vanguard fund redemption invested directly in shares of another Vanguard fund. You may initiate an exchange online (if you are a registered user of vanguard.com), by telephone, or by mail.

By check. If you have not chosen another redemption method, Vanguard will mail you a redemption check, generally payable to all registered account owners, normally within two business days of your trade date.

The trade date for any redemption request received in good order will depend on the day and time Vanguard receives your request and the manner in which you are

redeeming. Your redemption will be executed using the NAV as calculated on the trade date. NAVs are calculated only on days that the NYSE is open for trading (a business day).

For redemptions by check, exchange, or wire: If the redemption request is received by Vanguard on a business day before the close of regular trading on the NYSE (generally 4 p.m., Eastern time), the trade date will be the same day. If the redemption request is received on a business day after the close of regular trading on the NYSE, or on a nonbusiness day, the trade date will be the next business day.

• Note on timing of wire redemptions from money market funds: For telephone requests received by Vanguard on a business day before 10:45 a.m., Eastern time (2 p.m., Eastern time, for Vanguard Prime Money Market Fund), the redemption proceeds generally will leave Vanguard by the close of business the same day. For telephone requests received by Vanguard on a business day after those cut-off times, or on a nonbusiness day, and for all requests other than by telephone, the redemption proceeds generally will leave Vanguard by the close of business on the next business day.

• Note on timing of wire redemptions from bond funds: For requests received by Vanguard on a business day before the close of regular trading on the NYSE (generally 4 p.m., Eastern time), the redemption proceeds generally will leave Vanguard by the close of business on the next business day. For requests received by Vanguard on a business day after the close of regular trading on the NYSE, or on a nonbusiness day, the redemption proceeds generally will leave Vanguard by the close of business on the second business day after Vanguard receives the request.

For redemptions by electronic bank transfer using an Automatic Withdrawal Plan: Your trade date generally will be the date you designated for withdrawal of funds (redemption of shares) from your Vanguard account. Proceeds of redeemed shares generally will be credited to your designated bank account two business days after your trade date. If the date you designated for withdrawal of funds from your Vanguard account falls on a weekend, holiday, or other nonbusiness day, your trade date generally will be the previous business day.

For redemptions by electronic bank transfer not using an Automatic Withdrawal Plan: If the redemption request is received by Vanguard on a business day before the close of regular trading on the NYSE (generally 4 p.m., Eastern time), the trade date will be the same day. If the redemption request is received on a business day after the close of regular trading on the NYSE, or on a nonbusiness day, the trade date will be the next business day.

complete your transaction. If Vanguard is still unable to complete the transaction, we may send the proceeds of the redemption to you by check, generally payable to all registered account owners, or use your proceeds to purchase new shares of the Fund from which you sold shares for the purpose of the wire or electronic bank transfer transaction. See Other Rules You Should Know—Good Order.

For further information about redemption transactions, consult our website at vanguard.com or see Contacting Vanguard.

The Funds each charge a 2% redemption fee on shares redeemed before they have been held for two months. The fee applies if you redeem shares by selling or by exchanging to another Vanguard fund, or if Vanguard liquidates your Fund account because the balance falls below the minimum initial investment for any reason, including market fluctuation. The fee is withheld from redemption proceeds and is paid directly to the Fund. Shares held for two months or more are not subject to the redemption fee.

In an effort to reduce or eliminate the redemption fees you pay, if you redeem less than your full investment in the Fund, we will first redeem those shares not subject to the fee (see below), followed by those shares you have held the longest.

Redemption fees will not apply to Vanguard fund account redemptions in the following circumstances: (1) redemptions of shares to pay fund or account fees; redemptions of shares to revoke an IRA within the period of time set forth in the Vanguard Traditional and Roth IRA Disclosure Document or to remove excess shareholder contributions to an IRA; and redemptions from Section 529 college savings plans; (2) share transfers, rollovers, or reregistrations within the same fund; (3) conversions of shares from one share class to another in the same fund; (4) redemptions in kind; and (5) for a one-year period, shares rolled over to an IRA held at Vanguard from a retirement plan for which Vanguard serves as recordkeeper.*

In addition, redemption fees will not apply to (1) distributions by shareholders age 70½ or older from traditional IRAs, rollover IRAs, SEP-IRAs, SIMPLE IRAs, certain Individual Section 403(b)(7) Custodial Accounts, Vanguard Individual 401(k) Plans; and (2) distributions by beneficiaries from inherited IRAs, certain Individual Section 403(b)(7) Custodial Accounts, and Vanguard Individual 401(k) Plans.

Also, participants in employer-sponsored defined contribution plans* will not incur redemption fees for the following: exchanges of shares purchased with participant payroll or employer contributions; distributions, loans, and in-service withdrawals from a plan; redemptions or transfers of shares as part of a plan termination or at the direction of the plan; and direct rollovers into IRAs.

Participants will incur redemption fees if, after making an exchange, transfer, or rollover into a fund with a redemption fee, the participant makes a subsequent exchange out of that fund within the redemption-fee period.

If Vanguard does not serve as recordkeeper for your plan, redemption fees may be applied differently. Please read your recordkeeper’s plan materials carefully to learn of any other rules or fees that may apply. Also see Frequent-Trading Policy—Accounts Held by Intermediaries for information about the assessment of redemption fees by intermediaries.

* The following Vanguard fund accounts will be subject to redemption fees: SEP–IRAs, SIMPLE IRAs, certain Section 403(b)(7) accounts, Vanguard Retirement Investment Program pooled plans, and Vanguard Individual 401K Plans.

You generally will continue earning dividends until the first business day following your trade date.

Documentation for certain accounts. Special documentation may be required to redeem from certain types of accounts, such as trust, corporate, nonprofit, or retirement accounts. Please call us before attempting to redeem from these types of accounts.

Potentially disruptive redemptions. Vanguard reserves the right to pay all or part of a redemption in kind—that is, in the form of securities—if we reasonably believe that a cash redemption would negatively affect the fund’s operation or performance or that the shareholder may be engaged in market-timing or frequent trading. Under these circumstances, Vanguard also reserves the right to delay payment of the redemption proceeds for up to seven calendar days. By calling us before you attempt to redeem a large dollar amount, you may avoid in-kind or delayed payment of your redemption. Please see Frequent-Trading Policy for information about Vanguard’s policies to limit frequent trading.

Recently purchased shares. Although you can redeem shares at any time, proceeds may not be made available to you until the fund collects payment for your purchase. This may take up to ten calendar days for shares purchased by check or by electronic bank transfer. If you have written a check on a fund with checkwriting privileges, that check may be rejected if your fund account does not have a sufficient available balance.

Address change. If you change your address online or by telephone, there may be up to a 15-day restriction on your ability to request check redemptions online and by telephone. You can request a redemption in writing at any time. Confirmations of address changes are sent to both the old and new addresses.

Payment to a different person or address. At your request, we can make your redemption check payable, or wire your redemption proceeds, to a different person or send it to a different address. However, this generally requires the written consent of all registered account owners and may require a signature guarantee or a notarized signature. You may obtain a signature guarantee from some commercial or savings banks, credit unions, trust companies, or member firms of a U.S. stock exchange.

No cancellations. Vanguard will not accept your request to cancel any redemption request once processing has begun. Please be careful when placing a redemption request.

Emergency circumstances. Vanguard funds can postpone payment of redemption proceeds for up to seven calendar days. In addition, Vanguard funds can suspend redemptions and/or postpone payments of redemption proceeds beyond seven calendar days at times when the NYSE is closed or during emergency circumstances, as determined by the SEC.

An exchange occurs when you use the proceeds from the redemption of shares of one Vanguard fund to simultaneously purchase shares of a different Vanguard fund. You can make exchange requests online (if you are a registered user of vanguard.com), by telephone, or by mail. See Purchasing Shares and Redeeming Shares.

If the NYSE is open for regular trading (generally until 4 p.m., Eastern time, on a business day) at the time an exchange request is received in good order, the trade date generally will be the same day. See Other Rules You Should Know—Good Order for additional information on all transaction requests.

Vanguard will not accept your request to cancel any exchange request once processing has begun. Please be careful when placing an exchange request.

Please note that Vanguard reserves the right, without notice, to revise or terminate the exchange privilege, limit the amount of any exchange, or reject an exchange, at any time, for any reason.

Because excessive transactions can disrupt management of a fund and increase the fund’s costs for all shareholders, the board of trustees of each Vanguard fund places certain limits on frequent trading in the funds. Each Vanguard fund (other than money market funds and short-term bond funds) limits an investor’s purchases or exchanges into a fund account for 60 calendar days after the investor has redeemed or exchanged out of that fund account. ETF Shares are not subject to these frequent-trading limits. The brokerage firm through which you hold your ETF Shares, however,

may place certain limits on your ability to purchase and/or sell ETF Shares over any given period.

For Vanguard Retirement Investment Program pooled plans, the policy applies to exchanges made online or by phone.

• Purchases of shares with reinvested dividend or capital gains distributions.

• Transactions through Vanguard’s Automatic Investment Plan, Automatic Exchange Service, Direct Deposit Service, Automatic Withdrawal Plan, Required Minimum Distribution Service, and Vanguard Small Business Online^®.

• Transaction requests submitted by mail to Vanguard from shareholders who hold their accounts directly with Vanguard. (Transaction requests submitted by fax, if otherwise permitted, are not mail transactions and are subject to the policy.)

• Certain approved institutional portfolios and asset allocation programs, as well as trades made by Vanguard funds that invest in other Vanguard funds. (Please note that shareholders of Vanguard’s funds of funds are subject to the policy.)

For participants in employer-sponsored defined contribution plans,* the frequent-trading policy does not apply to:

• Purchases of shares with participant payroll or employer contributions or loan repayments.

• Purchases of shares with reinvested dividend or capital gains distributions.

• Redemptions of shares as part of a plan termination or at the direction of the plan.

• Automated transactions executed during the first six months of a participant’s enrollment in the Vanguard Managed Account Program.

• Exchange requests submitted by mail to Vanguard. (Exchange requests submitted by fax, if otherwise permitted, are not mail requests and are subject to the policy.)

* The following Vanguard fund accounts are subject to the frequent-trading policy: SEP-IRAs, SIMPLE IRAs, certain Section 403(b)(7) accounts, and Vanguard Retirement Plans for which Vanguard Fiduciary Trust Company serves as trustee.

Vanguard will systematically monitor for frequent trading in institutional clients’ accounts. If we detect suspicious trading activity, we will investigate and take appropriate action, which may include applying to a client’s accounts the 60-day policy previously described, prohibiting a client’s purchases of fund shares, and/or revoking the client’s exchange privilege.

When intermediaries establish accounts in Vanguard funds for the benefit of their clients, we cannot always monitor the trading activity of the individual clients. However, we review trading activity at the intermediary (omnibus) level, and if we detect suspicious activity, we will investigate and take appropriate action. If necessary, Vanguard may prohibit additional purchases of fund shares by an intermediary, including for the benefit of certain of the intermediary’s clients. Intermediaries also may monitor their clients’ trading activities with respect to Vanguard funds.

For those Vanguard funds that charge purchase or redemption fees, intermediaries will be asked to assess purchase and redemption fees on client accounts and remit these fees to the funds. The application of purchase and redemption fees and frequent-trading policies may vary among intermediaries. There are no assurances that Vanguard will successfully identify all intermediaries or that intermediaries will properly assess purchase and redemption fees or administer frequent-trading policies. If you invest with Vanguard through an intermediary, please read that firm’s materials carefully to learn of any other rules or fees that may apply.

Vanguard attempts to eliminate the unnecessary expense of duplicate mailings by sending just one summary prospectus (or prospectus) and/or shareholder report when two or more shareholders have the same last name and address. You may request individual prospectuses and reports by contacting our Client Services Department in writing, by telephone, or by e-mail.

Registration. If you are a registered user of vanguard.com, you can review your account holdings; buy, sell, or exchange shares of most Vanguard funds; and perform most other transactions online. You must register for this service online.

Electronic delivery. Vanguard can deliver your account statements, transaction confirmations, and shareholder reports electronically. If you are a registered user of vanguard.com, you can consent to the electronic delivery of these documents by logging on and changing your mailing preference under “Account Profile.” You can revoke your electronic consent at any time online, and we will begin to send paper copies of these documents within 30 days of receiving your revocation.

Automatic. When we set up your account, we’ll automatically enable you to do business with us by telephone, unless you instruct us otherwise in writing.

Tele-Account^®. To conduct account transactions through Vanguard’s automated telephone service, you must first obtain a Personal Identification Number (PIN). Call Tele-Account at 800-662-6273 to obtain a PIN.

Proof of a caller’s authority. We reserve the right to refuse a telephone request if the caller is unable to provide the requested information or if we reasonably believe that the caller is not an individual authorized to act on the account. Before we allow a caller to act on an account, we may request the following information:

• Authorization to act on the account (as the account owner or by legal documentation or other means).

• Other information relating to the caller, the account owner, or the account.

We reserve the right to reject any transaction instructions that are not in “good order.

• Are provided by the person(s) authorized in accordance with Vanguard’s policies and procedures to access the account and request transactions.

• Include the amount of the transaction (stated in dollars, shares, or percentage).

• Signature guarantees or notarized signatures, if required for the type of transaction.

The requirements vary among types of accounts and transactions. For more information, consult our website at vanguard.com or see Contacting Vanguard.

Vanguard reserves the right, without notice, to revise the requirements for good order.

Vanguard does not accept requests to hold a purchase, conversion, redemption, or exchange transaction for a future date. All such requests will receive trade dates as previously described in Purchasing Shares, Converting Shares, and Redeeming Shares. Vanguard reserves the right to return future-dated purchase checks.

If an account has more than one owner or authorized person, Vanguard generally will accept telephone or online instructions from any one owner or authorized person.

Vanguard will not be responsible for any account losses because of fraud if we reasonably believe that the person transacting business on an account is authorized to do so. Please take precautions to protect yourself from fraud. Keep your account information private, and immediately review any account statements or other information that we provide to you. It is important that you contact Vanguard immediately about any transactions or changes to your account that you believe to be unauthorized.

Please cash your distribution or redemption checks promptly. Vanguard will not pay interest on uncashed checks.

If your account has no activity in it for a period of time, Vanguard may be required to transfer it to a state under the state’s abandoned property law.

If you experience difficulty contacting Vanguard online, by telephone, or by Tele-Account, you can send us your transaction request by regular or express mail. See

You may purchase or sell shares of most Vanguard funds through a financial intermediary, such as a bank, broker, or investment advisor. Please consult your financial intermediary to determine which, if any, shares are available through that firm and to learn about other rules that may apply.

Please see Frequent-Trading Policy—Accounts Held by Intermediaries for information about the assessment of any purchase or redemption fees and the monitoring of frequent trading for accounts held by intermediaries.

For most shareholders, Vanguard charges a $20 account service fee on all fund accounts that have a balance below $10,000 for any reason, including market fluctuation. The account service fee applies to both retirement and nonretirement fund accounts and will be assessed on fund accounts in all Vanguard funds, regardless of a fund’s minimum initial investment amount. The fee, which will be collected by redeeming fund shares in the amount of $20, will be deducted from a fund account only once per calendar year.

If you register on vanguard.com and elect to receive electronic delivery of statements, reports, and other materials for all of your fund accounts, the account service fee for balances below $10,000 will not be charged, so long as that election remains in effect.

• Money market sweep accounts owned in connection with a Vanguard Brokerage Services^®account.

• Accounts held by Voyager, Voyager Select, and Flagship clients. Eligibility is based on total household assets held at Vanguard, with a minimum of $50,000 to qualify for Vanguard Voyager Services^®, $500,000 for Vanguard Voyager Select Services^®, and $1 million for Vanguard Flagship Services^®. Vanguard determines eligibility by aggregating assets of all qualifying accounts held by the investor and immediate family members who reside at the same address. Aggregate assets include investments in Vanguard mutual funds, Vanguard ETFs^®, certain annuities through Vanguard, the Vanguard 529 Plan, and certain small-business accounts. Assets in employer-sponsored retirement plans for which Vanguard provides recordkeeping services may be included in determining eligibility if the investor also has a personal account holding Vanguard mutual funds. Note that assets held in a Vanguard Brokerage Services account (other than Vanguard funds, including Vanguard ETFs) are not included when determining a household’s eligibility.

• Participant accounts in employer-sponsored defined contribution plans.* Please consult your enrollment materials for the rules that apply to your account.

certain Section 403(b)(7) accounts, Vanguard Retirement Investment Program pooled plans, and Vanguard Retirement Plans for which Vanguard Fiduciary Trust Company serves as trustee.

Each Fund reserves the right to liquidate a fund account whose balance falls below the minimum initial investment for any reason, including market fluctuation. This policy applies to nonretirement fund accounts and accounts that are held through intermediaries. Shares redeemed in accordance with this policy will be subject to applicable redemption fees.

In addition to the rights expressly stated elsewhere in this prospectus, Vanguard reserves the right, without notice, to (1) alter, add, or discontinue any conditions of purchase (including eligibility requirements), redemption, exchange, conversion, service, or privilege at any time; (2) accept initial purchases by telephone; (3) freeze any account and/or suspend account services if Vanguard has received reasonable notice of a dispute regarding the assets in an account, including notice of a dispute between the registered or beneficial account owners, or if Vanguard reasonably believes a fraudulent transaction may occur or has occurred; (4) temporarily freeze any account and/or suspend account services upon initial notification to Vanguard of the death of the shareholder until Vanguard receives required documentation in good order; (5) alter, impose, discontinue, or waive any purchase fee, redemption fee, account service fee, or other fees charged to a group of shareholders; and (6) redeem an account or suspend account privileges, without the owner’s permission to do so, in cases of threatening conduct or activity Vanguard believes to be suspicious, fraudulent, or illegal. Changes may affect any or all investors. These actions will be taken when, at the sole discretion of Vanguard management, Vanguard reasonably believes they are deemed to be in the best interest of a fund.

Vanguard reserves the right, without notice, to change the eligibility requirements of its share classes, including the types of clients who are eligible to purchase each share class.

We will send (or provide online, whichever you prefer) a confirmation of your trade date and the amount of your transaction when you buy, sell, exchange, or convert shares. However, we will not send confirmations reflecting only checkwriting redemptions or the reinvestment of dividend or capital gains distributions. For any month in which you had a checkwriting redemption, a Checkwriting Activity Statement will be sent to you itemizing the checkwriting redemptions for that month. Promptly review each confirmation statement that we provide to you by mail or online. It is important that you contact Vanguard immediately with any questions you may have about any transaction reflected on a confirmation statement, or Vanguard will consider the transaction properly processed.

We will send (or provide online, whichever you prefer) quarterly portfolio summaries to help you keep track of your accounts throughout the year. Each summary shows the market value of your account at the close of the statement period, as well as all distributions, purchases, redemptions, exchanges, transfers, and conversions for the current calendar quarter. Promptly review each summary that we provide to you by mail or online. It is important that you contact Vanguard immediately with any questions you may have about any transaction reflected on the summary, or Vanguard will consider the transaction properly processed.

For most accounts, we are required to provide annual tax Forms to assist you in preparing your income tax returns. These Forms, which are generally mailed in January, will report the previous year’s dividends, capital gains distributions, proceeds from the sale of shares from taxable accounts, and distributions from IRAs and other retirement plans. Registered users of vanguard.com can also view these Forms online.

We will send (or provide online, whichever you prefer) reports about Vanguard International Bond Index Funds twice a year, in June and December. These reports include overviews of the financial markets and provide the following specific Fund information:

We generally post on our website at vanguard.com, in the Portfolio section of each Fund’s Portfolio & Management page, a detailed list of the securities held by the Fund, as of the end of the most recent calendar quarter. This list is generally updated within 30 days after the end of each calendar quarter. Vanguard may exclude any portion of these portfolio holdings from publication when deemed in the best interest of the Fund. Please consult the Fund’s Statement of Additional Information or our website for a description of the policies and procedures that govern disclosure of the Fund’s portfolio holdings.


Contacting Vanguard


Web
Vanguard.com	For the most complete source of Vanguard news
24 hours a day, 7 days a week	For fund, account, and service information
	For most account transactions
	For literature requests

Phone
Vanguard Tele-Account^®800-662-6273	For automated fund and account information
(ON-BOARD)	For exchange transactions (subject to limitations)
	Toll-free, 24 hours a day, 7 days a week
Investor Information 800-662-7447 (SHIP) For fund and service information
(Text telephone for people with hearing	For literature requests
impairment at 800-749-7273)	Business hours only: Monday–Friday, 8 a.m. to 10 p.m.,
	Eastern time; Saturday, 9 a.m. to 4 p.m., Eastern time
Client Services 800-662-2739 (CREW)	For account information
(Text telephone for people with hearing	For most account transactions
impairment at 800-749-7273)	Business hours only: Monday–Friday, 8 a.m. to 10 p.m.,
	Eastern time; Saturday, 9 a.m. to 4 p.m., Eastern time
Institutional Division	For information and services for large institutional investors
888-809-8102	Business hours only: Monday–Friday, 8:30 a.m. to 9 p.m.,
	Eastern time
Intermediary Sales Support	For information and services for financial intermediaries
800-997-2798	including broker-dealers, trust institutions, insurance
	companies, and financial advisors
	Business hours only: Monday–Friday, 8:30 a.m. to 7 p.m.,
	Eastern time

Please be sure to use the correct address, depending on your method of delivery. Use of an incorrect address could delay the processing of your transaction.

Bond. A debt security (IOU) issued by a corporation, government, or government agency in exchange for the money you lend it. In most instances, the issuer agrees to pay back the loan by a specific date and generally to make regular interest payments until that date.

Capital Gains Distribution. Payment to mutual fund shareholders of gains realized on securities that a fund has sold at a profit, minus any realized losses.

Coupon. The interest rate paid by the issuer of a debt security until its maturity. It is expressed as an annual percentage of the face value of the security.

Dividend Distribution. Payment to mutual fund shareholders of income from interest or dividends generated by a fund’s investments.

Expense Ratio. The percentage of a fund’s average net assets used to pay its expenses during a fiscal year. The expense ratio includes management expenses (such as advisory fees, account maintenance, reporting, internal accounting, legal, and other administrative expenses); any 12b-1 distribution fees; and “other” expenses (usually fees paid to independent third parties, such as the fund’s custodian and auditor). It does not include the transaction costs of buying and selling portfolio securities.

Face Value. The amount to be paid at a bond’s maturity; also known as the par value or principal.

Fixed Income Security. An investment, such as a bond, representing a debt that must be repaid by a specified date, and on which the borrower must pay a fixed, variable, or floating rate of interest.

Float-Adjusted Index. An index that weights its constituent securities based on the value of the constituent securities that are available for public trading, rather than the value of all constituent securities. Some portion of an issuer’s securities may be unavailable for public trading because, for example, those securities are owned by company insiders on a restricted basis or by a government agency. By excluding unavailable securities, float-adjusted indexes can produce a more accurate picture of the returns actually experienced by investors in the measured market.

Inception Date. The date on which the assets of a fund (or one of its share classes) are first invested in accordance with the fund’s investment objective. For funds with a subscription period, the inception date is the day after that period ends. Investment performance is measured from the inception date.

highest rating categories are considered “investment-grade.” Other debt securities may be considered by an advisor to be investment-grade.

Mutual Fund. An investment company that pools the money of many people and invests it in a variety of securities in an effort to achieve a specific objective over time.

Passive Management. A low-cost investment strategy in which a mutual fund attempts to track—rather than outperform—a specified market benchmark or “index”; also known as indexing.

Principal. The face value of a debt instrument or the amount of money put into an investment.

Total Return. A percentage change, over a specified time period, in a mutual fund’s net asset value, assuming the reinvestment of all distributions of dividends and capital gains.

Volatility. The fluctuations in value of a mutual fund or other security. The greater a fund’s volatility, the wider the fluctuations in its returns.

Yield. Income (interest or dividends) earned by an investment, expressed as a percentage of the investment’s price.


For More Information	If you are a current Vanguard shareholder and would
If you would like more information about Vanguard	like information about your account, account
International Bond Index Funds, the following	transactions, and/or account statements, please call:
documents will be available free upon request:
	Client Services Department
Annual/Semiannual Reports to Shareholders	Telephone: 800-662-2739 (CREW)
Additional information about the Funds’ investments	Text telephone for people with hearing impairment:
will be available in the Funds’ annual and semiannual	800-749-7273
reports to shareholders. In the annual report, you will
	Information Provided by the Securities and
find a discussion of the market conditions and
	Exchange Commission (SEC)
investment strategies that significantly affected the
	You can review and copy information about the Funds
Funds’ performance during their last fiscal year.
	(including the SAI) at the SEC’s Public Reference Room
Statement of Additional Information (SAI)	in Washington, DC. To find out more about this public
The SAI provides more detailed information about	service, call the SEC at 202-551-8090. Reports and
the Funds and is incorporated by reference into (and	other information about the Funds are also available in
thus legally a part of) this prospectus.	the EDGAR database on the SEC’s Internet site at
	sec.gov, or you can receive copies of this information,
To receive a free copy of the latest annual or semiannual
	for a fee, by electronic request at the following e-mail
report (once available) or the SAI, or to request
	address: publicinfo@sec.gov, or by writing the Public
additional information about the Funds or other
	Reference Section, Securities and Exchange
Vanguard funds, please visit vanguard.com or contact us
	Commission, Washington, DC 20549-1520.
as follows:
	Funds’ Investment Company Act file number: 811-22619
The Vanguard Group
Investor Information Department
P.O. Box 2600
Valley Forge, PA 19482-2600
Telephone: 800-662-7447 (SHIP)
Text telephone for people with hearing impairment:
800-749-7273

Vanguard International Bond Index Funds

Prospectus

January 17, 2012

Institutional Shares

Vanguard Total International Bond Index Fund Institutional Shares (ticker)

Vanguard Emerging Markets Government Bond Index Fund Institutional Shares (ticker)

Subject to Completion.

Preliminary Prospectus

Dated October 31, 2011

Information contained in this prospectus is subject to completion or amendment.

A registration statement for Vanguard Total International Bond Index Fund and

Vanguard Emerging Markets Government Bond Index Fund has been filed with the

U.S. Securities and Exchange Commission but has not yet become effective.

Shares of Vanguard Toal International Bond Index Fund and Vanguard Emerging

Markets Government Bond Index Fund may not be sold, nor may offers to buy be

accepted, prior to the time the registration statement becomes effective. This

communication shall not constitute an offer to sell, nor shall there be any sale of

these securities in any state in which such offer, solicitation, or sale would be

unlawful prior to registration or qualification under the securities laws of any

such state.

This is the Funds’ initial prospectus, so it contains no performance data.

The Securities and Exchange Commission (SEC) has not approved or disapproved these securities or

passed upon the adequacy of this prospectus. Any representation to the contrary is a criminal offense.

The Fund seeks to track the performance of a benchmark index that measures the investment return of investment-grade bonds issued outside of the United States.

The following table describes the fees and expenses you may pay if you buy and hold Institutional Shares of the Fund.

(Expenses that you pay each year as a percentage of the value of your investment)

Example

The following example is intended to help you compare the cost of investing in the Fund’s Institutional Shares with the cost of investing in other mutual funds. It illustrates the hypothetical expenses that you would incur over various periods if you invest $10,000 in the Fund’s shares. This example assume that the Shares provide a return of 5% a year and that operating expenses remain as stated in the preceding table. The results apply whether or not you redeem your investment at the end of the given period. Although your actual costs may be higher or lower, based on these assumptions your costs would be:


1 Year	3 Years
$26	$80

Portfolio Turnover

The Fund has no operating history and therefore has no portfolio turnover information.

Primary Investment Strategies

Primary Risks

An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.

Annual Total Returns

The Fund began operations on •, 2012, so performance information is not yet available.

Investment Advisor
The Vanguard Group, Inc.

Portfolio Managers

Gregory Davis, CFA, Principal of Vanguard and head of Vanguard’s Bond Index Group. He has co-managed the Fund since its inception in January 2012.

Yan Pu, CFA, Portfolio Manager. She has co-managed the Fund since its inception in January 2012.

Purchase and Sale of Fund Shares


Account Minimums	Institutional Shares
To open and maintain an account	$5 million
To add to an existing account	$100 (other than by Automatic Investment Plan,
	which has no established minimum)

Tax Information

Payments to Financial Intermediaries

The Fund and its investment advisor do not pay financial intermediaries for sales of Fund shares.

The Fund seeks to track the performance of a benchmark index that measures the investment return of U.S. dollar-denominated bonds issued by governments of emerging market countries.

The following table describes the fees and expenses you may pay if you buy and hold Institutional Shares of the Fund.

The following example is intended to help you compare the cost of investing in the Fund’s Institutional Shares with the cost of investing in other mutual funds. It illustrates the hypothetical expenses that you would incur over various periods if you invest $10,000 in the Fund’s shares. This example assumes that the Shares provide a return of 5% a year and that operating expenses remain as stated in the preceding table. The results apply whether or not you redeem your investment at the end of the given period. Although your actual costs may be higher or lower, based on these assumptions your costs would be:


1 Year	3 Years
$31	$97

Portfolio Turnover

The Fund has no operating history and therefore has no portfolio turnover information.

Primary Investment Strategies

Primary Risks

• Interest rate risk, which is the chance that bond prices overall will decline because of rising interest rates. Interest rate risk should be moderate for the Fund because it invests primarily in intermediate-term bonds, whose prices are less sensitive to interest rate changes than are the prices of long-term bonds.

• Credit risk, which is the chance that a bond issuer will fail to pay interest and principal in a timely manner, or that negative perceptions of the issuer’s ability to make such payments will cause the price of that bond to decline. Credit risk should be moderate for the Fund because it purchases investment-grade and high-yield bonds.

• Country/regional risk, which is the chance that world events—such as political upheaval, financial troubles, or natural disasters—will adversely affect the value of securities issued by foreign governments. Because the Fund may invest a large portion of its assets in securities of foreign governments located in any one country or region, the Fund’s performance may be hurt disproportionately by the poor performance of its investments in that area. Country/regional risk is especially high in emerging markets.

An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.

Annual Total Returns

The Fund began operations on •, 2012, so performance information is not yet available.

Investment Advisor
The Vanguard Group, Inc.

Portfolio Managers

Gregory Davis, CFA, Principal of Vanguard and head of Vanguard’s Bond Index Group. He has co-managed the Fund since its inception in January 2012.

Yan Pu, CFA, Portfolio Manager. She has co-managed the Fund since its inception in January 2012.

Purchase and Sale of Fund Shares


Account Minimums	Institutional Shares
To open and maintain an account	$5 million
To add to an existing account	$100 (other than by Automatic Investment Plan,
	which has no established minimum)

Tax Information

Payments to Financial Intermediaries

The Fund and its investment advisor do not pay financial intermediaries for sales of Fund shares.

• Variety of investments. Most Vanguard index funds generally invest in the securities of a wide variety of companies and industries.

• Relative performance consistency. Because they seek to track market benchmarks, index funds usually do not perform dramatically better or worse than their benchmarks.

More on the Funds

Share Class Overview

This prospectus offers the Funds’ Institutional Shares, which are generally for investors who invest a minimum of $5 million. A separate prospectus offers the Funds’ Investor Shares and Admiral™ Shares, which have investment minimums of $3,000 and $10,000, respectively. In addition, each Fund issues an exchange-traded class of shares (ETF Shares), which are also offered through a separate prospectus.

All share classes offered by a Fund have a same investment objective, strategies, and policies. However, different share classes have different expenses; as a result, their investment performances will differ.

Plain Talk About Costs of Investing

Costs are an important consideration in choosing a mutual fund. That’s because

you, as a shareholder, pay a proportionate share of the costs of operating a fund,

plus any transaction costs incurred when the fund buys or sells securities. These

costs can erode a substantial portion of the gross income or the capital

appreciation a fund achieves. Even seemingly small differences in expenses can,

over time, have a dramatic effect on a fund’s performance.