VANGUARD/PRIMECAP FUND
                SUPPLEMENT TO STATEMENT OF ADDITIONAL INFORMATION

                                  JULY 1, 1998

The Fund paid approximately $1,423,618,  $1,475,231, and $3,097,602 in brokerage
commissions  during its fiscal years ended  December 31, 1995,  1996,  and 1997,
respectively.  The Fund  nearly  doubled in size during  1997,  which is why the
total amount of brokerage commissions paid increased sharply in that year.

                                                                           PSB59

                            



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