March 16, 2000
DREYFUS INSTITUTIONAL MONEY MARKET FUND
SUPPLEMENT TO STATEMENT OF ADDITIONAL INFORMATION
DATED MAY 1, 1999
The following information replaces all contrary information contained
in the sections of the Statement of Additional Information ("SAI") entitled
"Description of the Fund", "Management of the Fund" and "Management
Arrangements":
Effective March 16, 2000, Dreyfus Service Corporation ("DSC") became
the distributor to the Fund. DSC is located at 200 Park Avenue, New York, NY
10166.
The following information replaces the information contained in the
section of the Statement of Additional Information ("SAI") entitled "Management
of the Fund - Officers of the Fund":
FUND OFFICERS:
Stephen E. Canter, President. President, Chief Operating Officer, and Chief
Investment Officer of the Manager, and an officer of other investment
companies advised and administered by the Manager. Mr. Canter also is a
Director or an Executive Committee Member of the other investment
management subsidiaries of Mellon Financial Corporation, each of which is
an affiliate of the Manager. He is 54 years old.
Joseph Connolly, Vice President and Treasurer. Director - Mutual Fund Accounting
of the Manager, and an officer of other investment companies advised and
administered by the Manager. He is 42 years old.
Mark N. Jacobs, Vice President. Vice President, Secretary, and General Counsel
of the Manager, and an officer of other investment companies advised and
administered by the Manager. He is 53 years old.
Michael A. Rosenberg, Secretary. Associate General Counsel of the Manager, and
an officer of other investment companies advised and administered by the
Manager. He is 40 years old.
Steven F. Newman, Assistant Secretary. Associate General Counsel of the Manager,
and an officer of other investment companies advised and administered by
the Manager. He is 50 years old.
Robert R. Mullery, Assistant Secretary. Assistant General Counsel of the
Manager, and an officer of other investment companies advised and
administered by the Manager. He is 48 years old.
Michael Condon, Assistant Treasurer. Senior Treasury Manager of the Manager, and
an officer of other investment companies advised and administered by the
Manager. He is 38 years old.
The address of each Fund officer is 200 Park Avenue, New York, NY
10166.
