MFS SERIES TRUST I
497, 2000-06-20
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                       MFS GLOBAL TELECOMMUNICATIONS FUND

                   SUPPLEMENT TO PROSPECTUS DATED JUNE 1, 2000

The description of how to purchase  shares under the "How to Purchase,  Exchange
and Redeem Shares" section is hereby supplemented as follows:

Initial Offering

For the period from June 1, 2000 through June 26, 2000, the fund's  distributor,
MFS Fund Distributors,  Inc. will be soliciting subscriptions for Class A, Class
B and Class C shares  of the  fund.  In order to  facilitate  investment  of the
proceeds  raised  during the  initial  offering  period,  the fund will close to
purchases on June 27, 2000. The fund expects to commence its continuous offering
of shares on or about August 1, 2000.  During the period when the fund is closed
to purchases,  shareholders may redeem existing positions,  but the fund will be
closed to any new purchases.

The  minimum  subscription  amount is $1,000.  The fund's  transfer  agent,  MFS
Service Center, Inc. ("MFSC"), will accept checks accompanying  applications for
the purchase of shares of the fund  received on June 27, 2000.  Checks  received
prior to June 27, 2000 may be returned by MFSC.  In  addition,  exchange  orders
from  another  fund in the MFS Family of Funds will also be accepted on June 27,
2000;  exchange  orders  received  prior to that date will be  rejected.  Shares
subscribed for during the initial offering period will be sold to subscribers on
the purchase date, which is expected to occur not later than June 27, 2000.


                  The date of this Supplement is June 20, 2000


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