BNDX Vanguard Total International Bond

Vanguard Total International Bond Index Fund Summary Prospectus

February 27, 2020

Investor Shares & Admiral™ Shares

Vanguard Total International Bond Index Fund Investor Shares (VTIBX)

Vanguard Total International Bond Index Fund Admiral Shares (VTABX)

The Fund's statutory Prospectus and Statement of Additional Information dated February 27, 2020, as may be amended or supplemented, are incorporated into and made part of this Summary Prospectus by reference.

Before you invest, you may want to review the Fund's Prospectus, which contains more information about the Fund and its risks. You can find the Fund's Prospectus and other information about the Fund online at www.vanguard.com/prospectus. You can also obtain this information at no cost by calling 800-662-7447 or by sending an email request to online@vanguard.com.

See the inside front cover for important information about access to your fund's annual and semiannual shareholder reports.

The Securities and Exchange Commission (SEC) has not approved or disapproved these securities or passed upon the adequacy of this prospectus. Any representation to the contrary is a criminal offense.

Important information about access to shareholder reports

Beginning on January 1, 2021, as permitted by regulations adopted by the SEC, paper copies of your fund's annual and semiannual shareholder reports will no longer be sent to you by mail, unless you specifically request them. Instead, you will be notified by mail each time a report is posted on the website and will be provided with a link to access the report.

If you have already elected to receive shareholder reports electronically, you will not be affected by this change and do not need to take any action. You may elect to receive shareholder reports and other communications from the fund electronically by contacting your financial intermediary (such as a broker-dealer or bank) or, if you invest directly with the fund, by calling Vanguard at one of the phone numbers on the back cover of this prospectus or by logging on to vanguard.com.

You may elect to receive paper copies of all future shareholder reports free of charge. If you invest through a financial intermediary, you can contact the intermediary to request that you continue to receive paper copies. If you invest directly with the fund, you can call Vanguard at one of the phone numbers on the back cover of this prospectus or log on to vanguard.com. Your election to receive paper copies will apply to all the funds you hold through an intermediary or directly with Vanguard.

Investment Objective

The Fund seeks to track the performance of a benchmark index that measures the investment return of non-U.S. dollar-denominated investment-grade bonds.

Fees and Expenses

The following table describes the fees and expenses you may pay if you buy and hold Investor Shares or Admiral Shares of the Fund.

Shareholder Fees

(Fees paid directly from your investment)

	Investor Shares	Admiral Shares
Sales Charge (Load) Imposed on Purchases	None	None
Purchase Fee	None	None
Sales Charge (Load) Imposed on Reinvested Dividends	None	None
Redemption Fee	None	None
Account Service Fee (for certain fund account balances below	$20/year	$20/year
$10,000)

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Annual Fund Operating Expenses

(Expenses that you pay each year as a percentage of the value of your investment)

	Investor Shares	Admiral Shares
Management Fees	0.12%	0.10%
12b-1 Distribution Fee	None	None
Other Expenses	0.01%	0.01%
Total Annual Fund Operating Expenses	0.13%	0.11%

Examples

The following examples are intended to help you compare the cost of investing in the Fund's Investor Shares or Admiral Shares with the cost of investing in other mutual funds. They illustrate the hypothetical expenses that you would incur over various periods if you were to invest $10,000 in the Fund's shares. These examples assume that the shares provide a return of 5% each year and that total annual fund operating expenses remain as stated in the preceding table. You would incur these hypothetical expenses whether or not you were to redeem your investment at the end of the given period. Although your actual costs may be higher or lower, based on these assumptions your costs would be:

	1 Year	3 Years	5 Years	10 Years
Investor Shares	$13	$42	$73	$166
Admiral Shares	$11	$35	$62	$141

Portfolio Turnover

The Fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in more taxes when Fund shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the previous expense examples, reduce the Fund's performance. During the most recent fiscal year, the Fund's portfolio turnover rate was 26% of the average value of its portfolio.

Principal Investment Strategies

The Fund employs an indexing investment approach designed to track the performance of the Bloomberg Barclays Global Aggregate ex-USD Float Adjusted RIC Capped Index (USD Hedged). This Index provides a broad-based measure of the global, investment-grade, fixed-rate debt markets. The Index includes government, government agency, corporate, and securitized non-U.S. investment-grade fixed income investments, all issued in currencies other than the U.S. dollar and with maturities of more than one year. The Index is market value-weighted and capped to comply with investment company diversification standards of the Internal Revenue Code, which state that, at the close of each fiscal quarter, a fund's (1) exposure to any particular bond issuer may not exceed 25% of the fund's assets and (2) aggregate exposure to issuers that individually constitute 5% or more

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of the fund may not exceed 50% of the fund's assets. To help enforce these limits, if the Index, on the last business day of any month, were to have greater than 20% exposure to any particular bond issuer, or greater than 48% aggregate exposure to issuers that individually constitute 5% or more of the Index, then the excess would be reallocated to bonds of other issuers represented in the Index. The Index methodology is not designed to satisfy the diversification requirements of the Investment Company Act of 1940. The Fund will attempt to hedge its foreign currency exposure, primarily through the use of foreign currency exchange forward contracts, in order to correlate to the returns of the Index, which is U.S. dollar hedged. Such hedging is intended to minimize the currency risk associated with investment in bonds denominated in currencies other than the U.S. dollar.

The Fund invests by sampling the Index, meaning that it holds a range 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, under normal circumstances, at least 80% of the Fund's assets will be invested in bonds included in the Index. The Fund maintains a dollar-weighted average maturity consistent with that of the Index. As of October 31, 2019, the dollar-weighted average maturity of the Index was 9.9 years.

Principal Risks

An investment in the Fund could lose money over short or long periods of time. You should expect the Fund's share price and total return to fluctuate within a wide range. The Fund is subject to the following risks, which could affect the Fund's performance:

•Country/regional risk, which is the chance that world events—such as political upheaval, financial troubles, or natural disasters—will adversely affect the value and/or liquidity of securities issued by foreign companies, governments, or government agencies. Because the Fund may invest a large portion of its assets in bonds of issuers located in a particular country or region, the Fund's performance may be hurt disproportionately by the poor performance of its investments in that area. Country/regional risk for the Fund is high.

•Interest rate risk, which is the chance that bond prices will decline because of rising interest rates. Interest rate risk should be moderate for the Fund because it invests in a geographically diverse mix of short-, intermediate-, and long-term bonds.

•Income risk, which is the chance that the Fund's income will decline because of falling interest rates. Income risk should be moderate for the Fund because it invests in a diverse mix of short-, intermediate-, and long-term bonds, so investors should expect the Fund's monthly income to fluctuate.

•Nondiversification risk, which is the chance that the Fund's performance may be hurt disproportionately by the poor performance of bonds issued by just a few issuers or even a single issuer. The Fund is considered nondiversified, which means that it may invest a significant percentage of its assets in bonds issued by a small number of issuers as compared with diversified mutual funds.

•Credit risk, which is the chance that a bond issuer will fail to pay interest or principal in a timely manner or that negative perceptions of the issuer's ability to make such payments will cause the price of that bond to decline. Credit risk should be relatively low for the Fund because it purchases only bonds that are of investment-grade quality.

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•Call risk, which is the chance that during periods of falling interest rates, issuers of callable bonds may call (redeem) securities with higher coupon rates or interest rates before their maturity dates. The Fund would then lose any price appreciation above the bond's call price and would be forced to reinvest the unanticipated proceeds at lower interest rates, resulting in a decline in the Fund's income. Such redemptions and subsequent reinvestments would also increase the Fund's portfolio turnover rate. Call risk should be low for the Fund because it invests only a small portion of its assets in callable bonds.

•Index sampling risk, which is the chance that the securities selected for the Fund, in the aggregate, will not provide investment performance matching that of the Fund's target index. Index sampling risk for the Fund is expected to be low.

•Currency risk and currency hedging risk. The Fund seeks to mimic the performance of foreign bonds without regard to currency exchange rate fluctuations. To accomplish this goal, the Fund attempts to offset, or hedge, its foreign currency exposure by entering into currency hedging transactions, primarily through the use of foreign currency exchange forward contracts (a type of derivative). However, it generally is not possible to perfectly hedge the Fund's foreign currency exposure. The Fund will decline in value if it underhedges a currency that has weakened or overhedges a currency that has strengthened relative to the U.S. dollar. In addition, the Fund will incur expenses to hedge its foreign currency exposure. By entering into currency hedging transactions, the Fund may eliminate any chance to benefit from favorable fluctuations in relevant currency exchange rates. Currency risk and currency hedging risk for the Fund is low. The Fund's use of foreign currency exchange forward contracts also subjects the Fund to counterparty risk, which is the chance that the counterparty to a currency forward contract with the Fund will be unable or unwilling to meet its financial obligations. Counterparty risk is low for the Fund.

•Derivatives risk. The Fund may invest in derivatives, which may involve risks different from, and possibly greater than, those of investments directly in the underlying securities or assets.

An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.

Annual Total Returns

The following bar chart and table are intended to help you understand the risks of investing in the Fund. The bar chart shows how the performance of the Fund's Admiral Shareshas varied from one calendar year to another over the periods shown. The table shows how the average annual total returns of the share classes presented compare with those of the Fund's target index, which has investment characteristics similar to those of the Fund. Keep in mind that the Fund's past performance (before and after taxes) does not indicate how the Fund will perform in the future. Updated performance information is available on our website at vanguard.com/performance or by calling Vanguard toll-free at 800-662-7447.

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Annual Total Returns — Vanguard Total International Bond Index Fund Admiral Shares

	2014		2015		2016		2017		2018		2019
40%
20%	8.82				4.66						7.88
			1.06				2.39		2.93
0%

-20%

-40%

During the periods shown in the bar chart, the highest return for a calendar quarter was 3.44% (quarter ended March 31, 2016), and the lowest return for a quarter was –2.92% (quarter ended June 30, 2015).

Average Annual Total Returns for Periods Ended December 31, 2019

			Since
	1 Year	5 Years	Inception
Vanguard Total International Bond Index Fund Admiral Shares
Return Before Taxes	7.88%	3.76%	4.15%
Return After Taxes on Distributions	6.43	2.72	3.20
Return After Taxes on Distributions and Sale of Fund Shares	4.66	2.42	2.78
Vanguard Total International Bond Index Fund Investor Shares
Return Before Taxes	7.76%	3.73%	4.12%
Bloomberg Barclays Global Aggregate ex-USD Float
Adjusted RIC Capped Index (USD Hedged)
(reflects no deduction for fees, expenses, or taxes)	8.06%	3.98%	4.41%

Actual after-tax returns depend on your tax situation and may differ from those shown in the preceding table. When after-tax returns are calculated, it is assumed that the shareholder was in the highest individual federal marginal income tax bracket at the time of each distribution of income or capital gains or upon redemption. State and local income taxes are not reflected in the calculations. Please note that after-tax returns are shown only for the Admiral Shares and may differ for each share class. After-tax returns are not relevant for a shareholder who holds fund shares in a tax-deferred account, such as an individual retirement account or a 401(k) plan. Also, figures captioned Return After Taxes on Distributions and Sale of Fund Shares may be higher than other figures for the same period if a capital loss occurs upon redemption and results in an assumed tax deduction for the shareholder.

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