BlackRock Bond Fund, Inc. BlackRock Total Return Fund BlackRock California Municipal Series Trust BlackRock California Municipal Bond Fund BlackRock Funds BlackRock Managed Volatility Portfolio BlackRock Short-Term Treasury Fund BlackRock Short Obligations Fund BlackRock Ultra-Short Obligations Fund BlackRock Funds II BlackRock Aggressive Growth Prepared Portfolio BlackRock Conservative Prepared Portfolio BlackRock Core Bond Portfolio BlackRock Emerging Market Local Debt Portfolio BlackRock Floating Rate Income Portfolio BlackRock GNMA Portfolio BlackRock Growth Prepared Portfolio BlackRock High Yield Bond Portfolio BlackRock Inflation Protected Bond Portfolio BlackRock International Bond Portfolio BlackRock Long Duration Bond Portfolio BlackRock Low Duration Bond Portfolio BlackRock Moderate Prepared Portfolio BlackRock Multi-Asset Income Portfolio BlackRock Secured Credit Portfolio BlackRock Strategic Income Opportunities Portfolio BlackRock U.S. Government Bond Portfolio LifePath^® Active 2015 Portfolio LifePath^® Active 2020 Portfolio LifePath^® Active 2025 Portfolio LifePath^® Active 2030 Portfolio LifePath^® Active 2035 Portfolio LifePath^® Active 2040 Portfolio LifePath^® Active 2045 Portfolio LifePath^® Active 2050 Portfolio LifePath^® Active 2055 Portfolio BlackRock Multi-State Municipal Series Trust BlackRock New Jersey Municipal Bond Fund BlackRock New York Municipal Bond Fund BlackRock Pennsylvania Municipal Bond Fund BlackRock Municipal Bond Fund, Inc. BlackRock High Yield Municipal Fund BlackRock National Municipal Fund BlackRock Short-Term Municipal Fund BlackRock Funds III BlackRock CoreAlpha Bond Fund BlackRock Municipal Series Trust BlackRock Intermediate Municipal Fund BlackRock World Income Fund, Inc. FDP Series, Inc. Marsico Growth FDP Fund MFS Research International FDP Fund Invesco Value FDP Fund Franklin Templeton Total Return FDP Fund Managed Account Series BlackRock U.S. Mortgage Portfolio

(each, a “Fund” and collectively, the “Funds”)

Supplement dated April 24, 2013 to the
Statement of Additional Information of each Fund

Effective immediately, Part II of each Fund’s Statement of Additional Information is amended as follows:

The first paragraph of the section entitled “Purchase of Shares” is a deleted in its entirety and replaced with the following:

Most BlackRock-advised open-end funds offer multiple classes of shares under a plan adopted under Rule 18f-3 under the Investment Company Act. Investor A Shares are sold to investors choosing the initial sales charge alternative and Investor B and Investor C Shares are sold to investors choosing the deferred sales charge alternative. Effective July 1, 2009, Investor B Shares of each Fund are no longer available for purchase except through exchanges, dividend reinvestments, and for purchase by certain employer-sponsored retirement plans. Shareholders with investments in Investor B Shares as of July 1, 2009 may continue to hold such shares until they automatically convert to Investor A Shares under the existing conversion schedule. All other features of Investor B Shares, including the Rule 12b-1 distribution and service fees, contingent deferred sales charge

schedules and conversion features, remain unchanged and continue in effect. Institutional Shares and Institutional Daily Shares are sold to certain eligible investors without a sales charge. Certain Funds offer Class R Shares, which are available only to certain employer-sponsored retirement plans and are sold without a sales charge. In addition, certain Funds offer Service Shares, BlackRock Shares and/or Class K Shares that are available only to certain eligible investors. Please see the appropriate Prospectus for your Fund to determine which classes are offered by your Fund and under what circumstances. Each class has different exchange privileges. See “Shareholder Services — Exchange Privilege.”

The fourth paragraph of the section entitled “Purchase of Shares – Institutional Shares and Institutional Daily Shares – Eligible Institutional Share Investors” is deleted in its entirety and replaced with the following:

Investors who currently own Institutional Shares or Institutional Daily Shares in a shareholder account are entitled to purchase additional Institutional Shares or Institutional Daily Shares of a Fund in that account. In addition, the following investors may purchase Institutional Shares or Institutional Daily Shares: employees, officers and directors/trustees of BlackRock, Inc., BlackRock Funds, Merrill Lynch & Co, Inc., The PNC Financial Services Group Inc., Barclays PLC or their respective affiliates and any trust, pension, profit-sharing or other benefit plan for such persons; institutional and individual retail investors with a minimum investment of $2 million who purchase through certain broker-dealers or directly from the Fund; certain employer-sponsored retirement plans; investors in selected fee based programs; clients of registered investment advisers who have $250,000 invested in the Funds; clients of the trust departments of PNC Bank and Bank of America, N.A. and their affiliates for whom they (i) act in a fiduciary capacity (excluding participant directed employee benefit plans); (ii) otherwise have investment discretion; or (iii) act as custodian for at least $2 million in assets; unaffiliated banks, thrifts or trust companies that have agreements with the Distributor; certain state sponsored 529 college savings plans; and holders of certain Merrill Lynch sponsored unit investment trusts (UITs) who reinvest dividends received from such UITs in shares of a Fund.

The first paragraph of the section entitled “Purchase of Shares — Initial Sales Charge Alternative — Investor A Shares” is deleted in its entirety and replaced with the following:

Investors who prefer an initial sales charge alternative may elect to purchase Investor A Shares. Investor A1 Shares generally are not continuously offered but are offered (i) for purchase by certain employer-sponsored retirement plans and (ii) to certain investors who currently hold Investor A1 Shares for dividend and capital gain reinvestment only. For ease of reference, Investor A and Investor A1 Shares are sometimes referred to herein as “front-end load shares.”

The first paragraph of the section entitled “Purchase of Shares — Reduced Initial Sales Charges — Purchase Privileges of Certain Persons” is deleted in its entirety and replaced with the following:

BlackRock may pay placement fees to dealers on purchases of Investor A Shares of all Funds, which may depend on the policies, procedures and trading platforms of your financial intermediary.

The first three paragraphs of the section entitled “Purchase of Shares – Reduced Initial Sales Charges — Other” are deleted in their entirety and replaced with the following:

Other. The following persons may also buy Investor A Shares without paying a sales charge: (a) certain employer-sponsored retirement plans (for purposes of this waiver, employer-sponsored retirement plans do not include SEP IRAs, SIMPLE IRAs or SARSEPs); (b) rollovers of current investments through certain employer-sponsored retirement plans provided the shares are transferred to the same BlackRock Fund as either a direct rollover, or subsequent to distribution, the rolled-over proceeds are contributed to a BlackRock IRA through an account directly with the Fund; or purchases by IRA programs that are sponsored by financial intermediary firms provided the financial intermediary firm has entered into a Class A Net Asset Value agreement with respect to such program with the Distributor; (c) insurance company separate accounts; (d) registered investment advisers, trust companies and bank trust departments exercising discretionary investment authority with respect to amounts to be invested in a Fund; (e) persons participating in a fee-based program (such as a wrap account) under which they pay advisory fees to a broker-dealer or other financial institution; (f) financial intermediaries who have entered into an agreement with the Distributor and have been approved by the Distributor to offer Fund shares to self-directed investment brokerage accounts that may or may not charge a transaction fee; (g) state sponsored 529 college savings plans; and (h) persons involuntarily liquidated from a Fund, who within 60 days of liquidation buy new shares of another BlackRock Fund (but only up to the amount that was liquidated). The following persons associated with the Funds, the Fund’s Manager, Sub-Advisers, Transfer Agent, Distributor, fund

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accounting agents, Barclays PLC and their affiliates may buy Investor A Shares of each of the Funds without paying a sales charge to the extent permitted by these firms including: (a) officers, directors and partners; (b) employees and retirees; (c) employees of firms who have entered into selling agreements to distribute shares of BlackRock-advised funds; (d) immediate family members of such persons (“immediate family members” shall be defined as the investor, the investor’s spouse or domestic partner, children, parents and siblings); and (e) any trust, pension, profit-sharing or other benefit plan for any of the persons set forth in (a) through (d). Investors who qualify for any of these exemptions from the sales charge should purchase Investor A Shares. The availability of Investor A Shares sales charge waivers may depend upon the policies, procedures and trading platforms of your financial intermediary; consult your financial adviser.

If you invest $1,000,000 ($250,000 for BlackRock Short-Term Municipal Fund of BlackRock Municipal Bond Fund, Inc., $500,000 for BlackRock Low Duration Bond Portfolio, BlackRock Floating Rate Income Portfolio and BlackRock Secured Credit Portfolio of BlackRock Funds II) or more in Investor A or Investor A1 Shares, you may not pay an initial sales charge. However, if you redeem your Investor A or Investor A1 Shares within eighteen months after purchase, you may be charged a deferred sales charge. The deferred sales charge on Investor A Shares is not charged in connection with: (a) redemptions of Investor A Shares purchased through certain employer-sponsored retirement plans and rollovers of current investments in a Fund through such plans; (b) exchanges described in “Exchange Privilege” below; (c) redemptions made in connection with minimum required distributions due to the shareholder reaching age 70¹/2 from IRA and 403(b)(7) accounts; (d) certain post-retirement withdrawals from an IRA or other retirement plan if you are over 59¹/2 years old and you purchased your shares prior to October 2, 2006; (e) redemptions made with respect to certain retirement plans sponsored by a Fund, BlackRock or its affiliates; (f) redemptions (i) within one year of a shareholder’s death or, if later, the receipt of a certified probate settlement (including in connection with the distribution of account assets to a beneficiary of the decedent) or (ii) in connection with a shareholder’s disability (as defined in the Code) subsequent to the purchase of Investor A Shares; (g) involuntary redemptions of Investor A Shares in accounts with low balances; (h) certain redemptions made pursuant to the Systematic Withdrawal Plan (described below); (i) redemptions related to the payment of BNY Mellon Investment Servicing Trust Company custodial IRA fees; and (j) redemptions when a shareholder can demonstrate hardship, in the absolute discretion of a Fund.

With respect to certain employer-sponsored retirement plans, if a dealer waives its right to receive a placement fee, the Fund may, at its own discretion, waive the CDSC (as defined below) related to purchases of $1,000,000 ($250,000 for BlackRock Short-Term Municipal Fund of BlackRock Municipal Bond Fund, Inc., and $500,000 for BlackRock Low Duration Bond Portfolio, BlackRock Floating Rate Income Portfolio and BlackRock Secured Credit Portfolio of BlackRock Funds II) or more of Investor A Shares. This may depend upon the policies, procedures and trading platforms of your financial intermediary; consult your financial adviser.

In the sections entitled “Purchase of Shares” and “Redemption of Shares,” the phrases “authorized qualified employee benefit plans” and “certain qualified employee benefit plans” are replaced with the phrase “certain employer-sponsored retirement plans”.

The section entitled “Purchase of Shares — Deferred Sales Charge Alternative — Investor B and Investor C Shares” is amended to add the following to the end of the seventh paragraph:

These may depend upon the policies, procedures and trading platforms of your financial intermediary; consult your financial adviser.

The first paragraph under the section entitled “Purchase of Shares – Class R Shares” is deleted in its entirety and replaced with the following:

Certain of the Funds offer Class R Shares as described in each such Fund’s Prospectus. Class R Shares are available only to certain employer-sponsored retirement plans. Class R Shares are not subject to an initial sales charge or a CDSC but are subject to an ongoing distribution fee of 0.25% per year and an ongoing service fee of 0.25% per year. Distribution fees are used to support the Fund’s marketing and distribution efforts, such as compensating financial advisers and other financial intermediaries, advertising and promotion. Service fees are used to compensate securities dealers and other financial intermediaries for service activities.

Shareholders should retain this supplement for future reference.

SAI-FI-0413SUP