December 1, 1995
DREYFUS INSTITUTIONAL MONEY MARKET FUND
SUPPLEMENT TO PROSPECTUS
DATED MAY 1, 1995
THE FOLLOWING INFORMATION SUPPLEMENTS OR REPLACES THE INFORMATION
CONTAINED IN THE SECTIONS OF THE FUND'S PROSPECTUS ENTITLED "MANAGEMENT OF
THE FUND," "HOW TO BUY FUND SHARES," "SHAREHOLDER SERVICES," AND "HOW TO
REDEEM FUND SHARES":
Dreyfus Transfer, Inc., a wholly-owned subsidiary of The Dreyfus
Corporation, is located at One American Express Plaza, Providence, Rhode
Island 02903, and serves as the Fund's Transfer and Dividend Disbursing Agent
(the "Transfer Agent").
Effective January 1, 1996, the telephone number for the following
transactions is 1-800-645-6561 or, if you are calling from overseas,
516-794-5452:
* Telephone Exchange Privilege
* Wire Redemption Privilege
* Telephone Redemption Privilege
175/179s120195
December 1, 1995
DREYFUS INSTITUTIONAL MONEY MARKET FUND
Supplement to Statement of Additional Information
Dated May 1, 1995
The following information supplements or replaces the information
contained in the following section of the Fund's Statement of Additional
Information:
CUSTODIAN, TRANSFER AND DIVIDEND DISBURSING AGENT,
COUNSEL AND INDEPENDENT AUDITORS
Dreyfus Transfer, Inc., a wholly owned subsidiary of the Manager, is
located at One American Express Plaza, Providence, Rhode Island 02903,
and serves as the Fund's transfer and dividend disbursing agent. Under a
transfer agency agreement with the Fund, the Transfer Agent arranges for
the maintenance of shareholder account records for the Fund, the handling
of certain communications between shareholders and the Fund and the
payment of dividends and distributions payable by the Fund. For these
services, the Transfer Agent receives a monthly fee computed on the basis
of the number of shareholder accounts it maintains for the Fund during the
month, and is reimbursed for certain out-of-pocket expenses. The Transfer
Agent has no part in determining the investment policies of the Fund or
which securities are to be purchased or sold by the Fund.
