Vanguard Total Bond Market Index Fund Admiral Shares 

This fund is designed to provide broad exposure to U.S. investment-grade bonds. Reflecting this goal, the fund invests in U.S. Treasuries and mortgage-backed securities of all maturities (short-, intermediate-, and long-term issues). As with other bond funds, one of the risks of the fund is that increases in interest rates may cause the price of the bonds in the portfolio to decrease—pricing the fund’s net asset value (NAV) lower. Because the fund invests in several segments and maturities of the fixed income market, investors may consider the fund their core bond holding.