Fund Description: Vanguard Total Bond Market ETF is an exchange-traded index fund or Index ETF which is a separate investment portfolio of the Vanguard Bond Index Funds, an investment management company. INVESTMENT OBJECTIVE: The Vanguard Total Bond Market ETF seeks to track the performance of the Barclays Capital U.S. Aggregate Float Adjusted Index, a broad market-weighted bond Index. INDEX DESCRIPTION: The Barclays Capital U.S. Aggregate Float Adjusted Index represents a wide spectrum of public, investment-grade, taxable, fixed income securities in the United States including government, corporate, and international dollar-denominated bonds, as well as mortgage-backed and asset-backed securities all with maturities of more than 1 year. FUND STRATEGY: The Fund employs a passive management or indexing investment approach designed to track the performance of the Index. The Fund invests by sampling the Index, meaning that it holds a broadly diversified collection of securities that, in the aggregate, approximates the full Index in terms of key risk factors and other characteristics. All of the Fund’s investments will be selected through the sampling process, and at least 80% of the Fund’s assets will be invested in bonds held in the Index. The Fund maintains a dollar-weighted average maturity consistent with that of the Index, which generally ranges between 5 and 10 years. FUND MANAGEMENT: The Vanguard Group, Inc. serves as the investment advisor to the Fund.