The performance data shown represent past performance, which is not a guarantee of future results. Investment returns and principal value will fluctuate so that investors' shares, when sold, may be worth more or less than their original cost. Current performance may be lower or higher than the performance data cited.

Performance data for periods of less than one year do not reflect the deduction of purchase and redemption fees. Maintenance, low-balance, and service fees may be assessed by some funds. None of these fees are reflected in the performance figures. If these fees were included, the performance would be lower. All other performance data are adjusted for purchase and redemption fees, where applicable.

Important fund performance information

A non-money market fund's SEC yield is based on a formula mandated by the Securities and Exchange Commission (SEC) that calculates a fund's hypothetical annualized income, as a percentage of its assets. A security's income, for the purposes of this calculation, is based on the current market yield to maturity (in the case of bonds) or projected dividend yield (for stocks) of the fund's holdings over a trailing 30 day period. This hypothetical income will differ (at times, significantly) from the fund's actual experience; as a result, income distributions from the fund may be higher or lower than implied by the SEC yield.

The SEC yield for a money market fund is calculated by annualizing its daily income distributions for the previous seven days.

* A measure of the variance in the rate of return. Beta and R-squared for Energy Index Fund Admiral are calculated for 36 months for returns relative to the Spliced US IMI Energy 25/50.

The yield for a money market fund more closely reflects the current earnings of the fund than its total return does.

For non-Vanguard funds, yield is defined as a fund's annualized current rate of investment income, calculated with a Securities and Exchange Commission formula that includes the fund's net income (based on the yield to maturity of each bond it holds), the average number of outstanding fund shares during the 30-day period reported by Morningstar, and the maximum offering price per share on the last day of the period. The data is provided by Morningstar and is only as current as the information supplied to Morningstar by third parties.

Some funds may charge purchase, redemption, and/or 12b-1 fees. All transactions are subject to any applicable terms and conditions in a Fund's prospectus, including, but not limited to, any applicable fees or other frequent trading and market-timing policies and procedures imposed by the Fund. All transactions are also subject to Vanguard Brokerage Services' Commission and Fee Schedules, policies, and procedures.

Individual fund families may impose additional minimum, fees, or charges. NTF, TF, and load funds are subject to the greater of the FundAccess minimum investment requirements or those identified in the fund's prospectus. Vanguard Brokerage Services may negotiate fund minimum investment requirements that are greater than or less than the program standards noted above. For complete information, read the prospectus carefully before investing. The offering conditions of the various funds included in the FundAccess program are subject to change at any time, including, but not limited to, fee classification (load, TF, or NTF) and transfer eligibility.

Transaction-fee (TF) and no-transaction-fee (NTF) funds. A transaction fee is a charge assessed by an intermediary, such as a broker-dealer or a bank, for assisting in the sale (redemption) or purchase of a security. NTF funds may carry a redemption fee. See the Vanguard brokerage commission and fee schedule for more information. A short-term redemption fees may also be charged by the outside fund family.

Mutual funds and exchange-traded funds (ETFs) are subject to risk, including possible loss of principal.

There may be other material differences between products that must be considered prior to investing.

For more information about Vanguard funds or ETFs, visit vanguard.com to obtain a prospectus or, if available, a summary prospectus. Investment objectives, risks, charges, expenses, and other important information about a fund are contained in the prospectus; read and consider it carefully before investing.