SUPPLEMENT TO THE COMMON CLASS PROSPECTUS AND STATEMENT OF ADDITIONAL
                                  INFORMATION

                CREDIT SUISSE WARBURG PINCUS MUNICIPAL BOND FUND

THE FOLLOWING INFORMATION SUPERSEDES CERTAIN INFORMATION IN THE FUND'S
PROSPECTUS AND STATEMENT OF ADDITIONAL INFORMATION.

Effective on or about December 12, 2001, the Credit Suisse Warburg Pincus
family of funds will be renamed the "Credit Suisse" family of funds, and each
fund's name will be changed to reflect this new designation. In addition,
beginning on or about December 12, the fund family's new internet address
will be changed to www.creditsuissefunds.com and the net asset values of the
Credit Suisse family of funds will be listed in The Wall Street Journal under
the heading "Credit Suisse." You can also find information about the Credit
Suisse family of funds by calling 800-927-2874.

In addition, effective on or about December 12, 2001, the following change
will be implemented for the fund:

     -   The fund's Common Class shares will be closed to new investors, other
         than (1) investors in employee retirement, stock, bonus, pension or
         profit sharing plans, (2) investment advisory clients of Credit Suisse
         Asset Management, LLC, (3) certain registered investment advisers
         ("RIAs") and (4) certain broker-dealers and RIAs with clients
         participating in comprehensive fee programs. Any Common Class
         shareholder as of the close of business on December 12, 2001 can
         continue to buy Common Class shares of the fund and open new accounts
         under the same social security number.

Prospective investors may be required to provide documentation to determine
their eligibility to purchase Common Class shares.

Dated:   November 8, 2001                                         WPMBD-16-1101