T. Rowe Price Short Municipal Income 

The fund normally invests at least 80% of its net assets (plus any borrowings for investment purposes) in municipal securities whose income is exempt from federal income taxes. Any derivatives that provide exposure to the investment focus suggested by the fund’s name, or to one or more market risk factors associated with the investment focus suggested by the fund’s name, are counted (as applicable) toward compliance with the fund’s 80% investment policy.