Supplement to the Current Prospectus

Effective  June 1, 2008,  the following  paragraph in the  sub-section  entitled
"Exchange  Privilege"  under the main  heading  "How to  Purchase,  Redeem,  and
Exchange Shares" is deleted in its entirety:

Eligible qualified  retirement plans can exchange their Class R, Class R1, Class
R2,  Class R3,  Class R4 and Class R5 shares for shares of the MFS Money  Market
Fund.


                  The date of this supplement is June 1, 2008.