VANGUARD/PRIMECAP FUND
PROSPECTUS SUPPLEMENT
JULY 1, 1998
The following information supplements the Investment Adviser section, which
begins on page 9 of the prospectus:
Joel P. Fried, Senior Vice President of PRIMECAP Management Company, and F.
Jack Liebau Jr., Vice President of PRIMECAP Management Company, each manage a
portion of the Fund's assets, along with existing managers Howard B. Schow and
Theo A. Kolokotrones. Messrs. Fried and Liebau have each been associated with
PRIMECAP since 1986.
PS591
