March 6, 2007

DREYFUS BASIC U.S. GOVERNMENT MONEY MARKET FUND

SUPPLEMENT TO COMBINED PROSPECTUS DATED JULY 1, 2006

The following information replaces the first sentence of the second paragragh of the section of the Fund’s Combined Prospectus entitled “Dreyfus BASIC U.S. Government Money Market Fund - GOAL/APPROACH”:

To pursue this goal, the fund invests in securities issued or guaranteed as to principal and interest by the U.S. government or its agencies or instrumentalities, and repurchase agreements (including tri-party repurchase agreements).