IVOG Vanguard S&P Mid Cap 400 Growth

Vanguard Funds

Supplement to the Prospectus

Prospectus Text Change

The following replaces similar text in the Investment Advisor section:

Vanguard’s Equity Investment Group is overseen by:

Mortimer J. Buckley , Chief Investment Officer and Managing Director of Vanguard. As Chief Investment Officer, he is responsible for the oversight of Vanguard’s Equity Investment and Fixed Income Groups. The investments managed by these two groups include active quantitative equity funds, equity index funds, active bond funds, index bond funds, stable value portfolios, and money market funds. Mr. Buckley joined Vanguard in 1991 and has held various senior leadership positions with Vanguard. He received his A.B. in economics from Harvard and an M.B.A. from Harvard Business School.

Joseph Brennan , CFA, Principal of Vanguard and head of Vanguard’s Equity Index Group. He has oversight responsibility for all equity index funds managed by the Equity Investment Group. He first joined Vanguard in 1991. He received his B.A. in economics from Fairfield University and an M.S. in finance from Drexel University.

John Ameriks , Ph.D., Principal of Vanguard and head of Vanguard’s Active Equity Group. He has oversight responsibility for all active quantitative equity funds managed by the Equity Investment Group. He joined Vanguard in 2003. He received his A.B. in economics from Stanford University and a Ph.D. in economics from Columbia University.