THORNBURG INVESTMENT TRUST, 497, 1997-04-25

THORNBURG INVESTMENT TRUST
497, 1997-04-25

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<logo>                        THORNBURG FUNDS
            Supplement to Institutional Class Shares Prospectus
                               April 1, 1997


This information supplements the Thornburg Funds Institutional Class Shares
Prospectus dated February 1, 1997.

     Thornburg Limited Term Municipal Fund California Portfolio ("Limited
     Term California Fund") commenced its offering of Institutional Class
     Shares on April 1, 1997.