MFS SERIES TRUST I
497, 2000-07-31
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                      MFS(R) GLOBAL TELECOMMUNICATIONS FUND

            Supplement Dated June 1, 2000 (as Revised August 1, 2000)
                           to the Current Prospectus

This Supplement  describes the fund's class I shares, and it supplements certain
information in the fund's  Prospectus  dated June 1, 2000. The caption  headings
used in  this  Supplement  correspond  with  the  caption  headings  used in the
Prospectus.

You may  purchase  class I  shares  only  if you are an  eligible  institutional
investor, as described under the caption "Description of Share Classes" below.


1.   RISK RETURN SUMMARY

     Performance  Table. The performance  table is not included because the fund
     has not had a full calendar year of investment operations.


2.   EXPENSE SUMMARY

     Expense Table. The "Expense Table" describes the fees and expenses that you
     may pay when you buy,  redeem  and hold  shares of the  fund.  The table is
     supplemented as follows:

                                                                        Class I
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage
  of offering price)..............................................        None
Maximum Deferred Sales Charge (Load) (as a percentage of original purchase
  price or redemption proceeds, whichever is less)................        None

Annual Fund Operating Expenses (expenses that are deducted from fund assets)

 Management Fees....................................     1.00%
 Distribution and Service (12b-1) Fees..............     None
 Other Expenses(1)..................................     0.22%
                                                         -----
 Total Annual Fund Operating Expenses(2)............     1.22%
--------------------
(1)    "Other  Expenses" are estimated  based on an average annual net assets of
       $750 million.  To the extent  average  annual net assets are less than or
       exceed $750 million,  the fund's "Other  Expenses" as a percentage of net
       assets  will be  higher  or  lower,  respectively.  However,  subject  to
       reimbursement,  the fund's  adviser  has agreed to pay the fund's  "Other
       Expenses"  to the extent  such  expenses  exceed  0.35% of the fund's net
       assets.

(2)    The fund has an  expense  offset  arrangement  which  reduces  the fund's
       custodian  fee based upon the amount of cash  maintained by the fund with
       its custodian  and dividend  disbursing  agent,  and may enter into other
       such arrangements and directed brokerage  arrangements  (which would also
       have the effect of reducing the fund's expenses). Any such fee reductions
       are not reflected in the table.  Had such fee reductions  been taken into
       account, "Total Annual Fund Operating Expenses" would be lower.

Example of Expenses. These expenses are intended to help you compare the cost of
investing  in a fund  with the cost of  investing  in other  mutual  funds.  The
"Example of Expenses" table is supplemented as follows:

The examples assume that:

     o    You invest $10,000 in the fund for the time periods  indicated and you
          redeem your shares at the end of the time periods;

     o    Your  investment  has a 5% return  each year and  dividends  and other
          distributions are reinvested; and

     o    The fund's operating expenses remain the same.

Although your actual costs may be higher or lower,  under these assumptions your
costs would be:

                                     Year 1           Year 3
                                     ------           ------

        Class I Shares                $124             $387

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3.   DESCRIPTION OF SHARE CLASSES


The "Description of Share Classes" is supplemented as follows:

If you are an eligible  institutional  investor (as  described  below),  you may
purchase  class I shares at net asset value  without an initial  sales charge or
CDSC upon redemption. Class I shares do not have annual distribution and service
fees, and do not convert to any other class of shares of the fund.

The following eligible institutional investors may purchase class I shares:

     o    certain  retirement plans  established for the benefit of employees of
          MFS and employees of MFS' affiliates;

     o   any  fund  distributed  by  MFD,  if the  fund  seeks  to  achieve  its
         investment  objective by investing  primarily in shares of the fund and
         other MFS funds;

     o   any retirement plan, endowment or foundation which:

          has, at the time of purchase of class I shares, aggregate assets of at
          least $100 million, and

          invests  at least $10  million  in class I shares  of the fund  either
          alone or in  combination  with  investments in class I shares of other
          MFS Funds (additional investments may be made in any amount).

          MFD may accept purchases from smaller plans, endowments or foundations
          or in smaller  amounts if it believes,  in its sole  discretion,  that
          such entity's  aggregate assets will equal or exceed $100 million,  or
          that such entity will make additional investments which will cause its
          total  investment to equal or exceed $10 million,  within a reasonable
          period of time;

     o   bank trust  departments  or law firms  acting as trustee or manager for
         trust accounts which,  on behalf of their clients (i) initially  invest
         at least  $100,000  in class I shares of the fund or (ii) have,  at the
         time of  purchase of class I shares,  aggregate  assets of at least $10
         million  invested  in class I shares  of the  fund  either  alone or in
         combination  with investments in class I shares of other MFS Funds. MFD
         may  accept  purchases  that do not  meet  these  dollar  qualification
         requirements  if it  believes,  in  its  sole  discretion,  that  these
         requirements will be met within a reasonable period of time. Additional
         investments may be made in any amount; and

     o   certain   retirement  plans  offered,   administered  or  sponsored  by
         insurance companies,  provided that these plans and insurance companies
         meet certain criteria established by MFD from time to time.


4.   HOW TO PURCHASE, EXCHANGE AND REDEEM SHARES

The discussion of "How to Purchase,  Exchange and Redeem Shares" is supplemented
as follows:

You may  purchase,  redeem and  exchange  class I shares only  through  your MFD
representative  or by contacting  MFSC (see the back cover of the Prospectus for
address  and phone  number).  You may  exchange  your class I shares for class I
shares of another MFS fund (if you are eligible to purchase them) and for shares
of the MFS Money Market Fund at net asset value.


    The date of this Supplement is June 1, 2000 (as revised August 1, 2000).



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