MFS SERIES TRUST I
497, 1997-04-10
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                            MFS STRATEGIC GROWTH FUND

   Supplement to the  Prospectus and Statement of Additional  Information  dated
January 1, 1997 as revised April 10, 1997.


     The following  information  should be read in  conjunction  with the Fund's
Prospectus  and Statement of Additional  Information  ("SAI"),  dated January 1,
1997 as revised April 10, 1997, and contains a description of Class I shares.

     Class I shares are  available  for  purchase  only by certain  investors as
described under the caption "Eligible Purchasers" below.

EXPENSE SUMMARY

Shareholder Transaction Expenses:                                      Class I
   Maximum Initial Sales Charge Imposed on Purchases of Fund
     Shares (as a percentage of offering price)........................  None
   Maximum Contingent Deferred Sales Charge (as a percentage
     of original purchase price or redemption proceeds, as applicable).  None

Annual Operating Expenses of the Fund (as a percentage of average net assets):
   Management Fees.....................................................  0.75%
   Rule 12b-1 Fees.....................................................  None
   Other Expenses (after expense limitation)(1)(2)(3)..................  0.50%
                                                                        -----
   Total Operating Expenses (after expense limitation)(3)..............  1.25%
         .........
(1) "Other  Expenses"  is based on Class A expenses  incurred  during the fiscal
     period  ended August 31, 1996.
(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  under  "Other Expenses."
(3) The   Adviser  has  agreed  to  bear  the  Fund's   expenses,   subject  to
    reimbursement  by the Fund, such that "Other  Expenses" do not exceed 0.50%
    per annum of its average daily net assets  during the currect  fiscal year.
    Otherwise,  "Other Expenses" and "Total Operating  Expenses" would be 1.34%
    and 2.09%, respectively. See "Other Information" below.

                               Example of Expenses

     An investor would pay the following  dollar amounts of expenses on a $1,000
investment  in Class I shares of the Fund,  assuming (a) a 5% annual  return and
(b) redemption at the end of each of the time periods indicated:

                           Period                      Class I
                           1 year....................    $13
                           3 years...................     40

     The  purpose  of  the  expense  table  above  is  to  assist  investors  in
understanding the various costs and expenses that a shareholder of the Fund will
bear  directly  or  indirectly.  A  more  complete  description  of  the  Fund's
management  fee is set forth under the caption  "Management  of the Fund" in the
Prospectus.

The "Example" set forth above should not be considered a representation  of past
or future  expenses  of the Fund;  actual  expenses  may be greater or less than
those shown.

ELIGIBLE PURCHASERS

Class I shares are  available  for  purchase  only by the  following  purchasers
("Eligible Purchasers"):

(i)  certain  retirement  plans  established  for the  benefit of  employees  of
     Massachusetts  Financial  Services Company ("MFS"),  the Fund's  investment
     adviser, and employees of MFS' affiliates;
<PAGE>

(ii) any fund distributed by MFS Fund  Distributors,  Inc.  ("MFD"),  the Fund's
     distributor,  if the fund seeks to achieve its investment objective by
     investing primarily in shares of the Fund and other funds distributed by 
     MFD;

(iii)any retirement  plan,  endowment or foundation  which (a) purchases  shares
     directly through MFD (rather than through a third party broker or dealer or
     other financial intermediary);  (b) has, at the time of purchase of Class I
     shares, aggregate assets of at least $100 million; and (c) 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  distributed by MFD
     (additional  investments may be made in any amount);  provided that 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; and

(iv) bank trust  departments  which initially  invest,  on behalf of their trust
     clients,  at  least  $100,000  in Class I  shares  of the Fund  (additional
     investments  may be made  in any  amount);  provided  that  MFD may  accept
     smaller initial purchases if it believes, in its sole discretion,  that the
     bank trust  department will make additional  investments,  on behalf of its
     trust  clients,  which will cause its total  investment  to equal or exceed
     $100,000 within a reasonable period of time.

In no event will the Fund,  MFS,  MFD or any of their  affiliates  pay any sales
commissions or  compensation  to any third party in connection  with the sale of
Class I shares; the payment of any such sales commission or compensation  would,
under the Fund's policies,  disqualify the purchaser as an eligible  investor in
Class I shares.

SHARE CLASSES OFFERED BY THE FUND

     Four classes of shares of the Fund currently are offered for sale,  Class A
shares,  Class B shares,  Class C shares and Class I shares.  Class I shares are
available for purchase only by Eligible  Purchasers,  as defined above,  and are
described in this Supplement.  Class A shares, Class B shares and Class C shares
are  described in the Fund's  Prospectus  and are  available for purchase by the
general public.

     Class A shares are offered at net asset value plus an initial  sales charge
up to a maximum of 5.75% of the offering  price (or a contingent  deferred sales
charge (a "CDSC") of 1.00% upon redemption  during the first year in the case of
purchases of $1 million or more and certain purchases by retirement  plans), and
are  subject to an annual  distribution  fee and  service fee up to a maximum of
0.35% per  annum.  Class B shares  are  offered  at net asset  value  without an
initial sales charge but are subject to a CDSC upon  redemption  (declining from
4.00%  during the first  year to 0% after six years) and an annual  distribution
fee and service fee up to a maximum of 1.00% per annum;  Class B shares  convert
to Class A shares  approximately eight years after purchase.  Class C shares are
offered at net asset value  without an initial sales charge but are subject to a
1.00% CDSC upon redemption during the first year and an annual  distribution fee
and service  fee up to a maximum of 1.00% per annum.  Class I shares are offered
at net asset value  without an initial  sales charge or CDSC and are not subject
to a  distribution  or  service  fee.  Class C shares  and Class I shares do not
convert to any other class of shares of the Fund.

OTHER INFORMATION

     Eligible  Purchasers may purchase Class I shares only directly through MFD.
Eligible  Purchasers  may exchange Class I shares of the Fund for Class I shares
of any other MFS Fund  available  for purchase by such  Eligible  Purchasers  at
their net asset value (if available for sale),  and may exchange  Class I shares
of the Fund for shares of the MFS Money Market Fund (if available for sale), and
may redeem Class I shares of the Fund at net asset value.  Distributions paid by
the Fund with  respect to Class I shares  generally  will be greater  than those
paid with respect to Class A shares,  Class B shares and Class C shares  because
expenses  attributable  to Class A  shares,  Class B shares  and  Class C shares
generally will be higher.

     Subject to termination  or revision at the sole  discretion of MFS, MFS has
agreed to bear the Fund's expenses such that the Fund's "Other  Expenses," which
are defined to include all Fund expenses  except for  management  fees and class
specific expenses, do not exceed 0.50% per annum of its average daily net assets
(the  "Maximum  Percentage").  The  obligation  of MFS to  bear  these  expenses
terminates  on the last day of the Fund's fiscal year in which the Fund's "Other
Expenses" are less than or equal to the Maximum Percentage. The payments made by
MFS on behalf of the Fund under this arrangement are subject to reimbursement by
the  Fund to MFS,  which  will be  accomplished  by the  payment  of an  expense
reimbursement  fee by the Fund to MFS  computed and paid monthly at a percentage
of its  average  daily net  assets  for its then  current  fiscal  year,  with a
limitation that immediately  after such payment the Fund's "Other Expenses" will
not exceed the Maximum Percentage. This expense reimbursement by the Fund to MFS
terminates  on the earlier of the date on which  payments made by the Fund equal
the prior payment of such reimbursable expenses by MFS or April 10, 2000.

                  The date of this Supplement is April 10, 1997



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