BLACKROCK MUNICIPAL BOND FUND, INC. Supplement dated ...

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BlackRock Funds VI BlackRock CoreAlpha Bond Fund

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BlackRock Index Funds, Inc. iShares MSCI EAFE International Index Fund iShares Russell 2000 Small-Cap Index Fund

BlackRock Large Cap Focus Growth Fund, Inc.

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BlackRock Mid Cap Dividend Series, Inc. BlackRock Mid Cap Dividend Fund

BlackRock Multi-State Municipal Series Trust BlackRock New Jersey Municipal Bond Fund BlackRock New York Municipal Opportunities Fund BlackRock Pennsylvania Municipal Bond Fund

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BlackRock Municipal Series Trust BlackRock Strategic Municipal Opportunities Fund

BlackRock Natural Resources Trust

BlackRock Series, Inc. BlackRock International Fund

BlackRock Strategic Global Bond Fund, Inc.

Managed Account Series BlackRock GA Disciplined Volatility Equity Fund BlackRock GA Dynamic Equity Fund

Managed Account Series II BlackRock U.S. Mortgage Portfolio

(each, a "Fund" and collectively, the "Funds")

Supplement dated November 23, 2020 to the Institutional Shares Summary Prospectus of each Fund (each, a "Summary Prospectus"), as supplemented to date

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Effective immediately, each Summary Prospectus is amended as follows:

In the section of each Summary Prospectus entitled "Purchase and Sale of Fund Shares," the Institutional Shares column of the table is deleted in its entirety and replaced with the following:

Minimum Initial Investment Minimum Additional Investment

Institutional Shares

There is no minimum initial investment for:

? Employer-sponsored retirement plans (not including SEP IRAs, SIMPLE IRAs or SARSEPs), state sponsored 529 college savings plans, collective trust funds, investment companies or other pooled investment vehicles, unaffiliated thrifts and unaffiliated banks and trust companies, each of which may purchase shares of the Fund through a Financial Intermediary that has entered into an agreement with the Fund's distributor to purchase such shares.

? Clients of Financial Intermediaries that: (i) charge such clients a fee for advisory, investment consulting, or similar services or (ii) have entered into an agreement with the Fund's distributor to offer Institutional Shares through a no-load program or investment platform.

? Clients investing through a self-directed IRA brokerage account program sponsored by a retirement plan recordkeeper, provided that such program offers only mutual fund options and that the program maintains an account with the Fund on an omnibus basis.

$2 million for individuals and "Institutional Investors," which include, but are not limited to, endowments, foundations, family offices, local, city, and state governmental institutions, corporations and insurance company separate accounts who may purchase shares of the Fund through a Financial Intermediary that has entered into an agreement with the Fund's distributor to purchase such shares.

$1,000 for:

? Clients investing through Financial Intermediaries that offer such shares on a platform that charges a transaction based sales commission outside of the Fund.

? Tax-qualified accounts for insurance agents that are registered representatives of an insurance company's broker-dealer that has entered into an agreement with the Fund's distributor to offer Institutional Shares, and the family members of such persons.

No subsequent minimum.

Shareholders should retain this Supplement for future reference. SPRO-PSFS-1120SUP

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OCTOBER 28, 2020

Summary Prospectus

BlackRock Municipal Bond Fund, Inc. | Investor and Institutional Shares ? BlackRock Short-Term Municipal Fund

Investor A: MELMX ? Investor C: MFLMX ? Institutional: MALMX

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 (including amendments and supplements), reports to shareholders and other information about the Fund, including the Fund's statement of additional information, online at . You can also get this information at no cost by calling (800) 441-7762 or by sending an e-mail request to prospectus.request@, or from your financial professional. The Fund's prospectus and statement of additional information, both dated October 28, 2020, as amended and supplemented from time to time, are incorporated by reference into (legally made a part of) this Summary Prospectus.

Beginning on January 1, 2021, as permitted by regulations adopted by the Securities and Exchange Commission, paper copies of the Fund's shareholder reports will no longer be sent by mail, unless you specifically request paper copies of the reports from BlackRock or from your financial intermediary, such as a broker-dealer or bank. Instead, the reports will be made available on a website, and you will be notified by mail each time a report is posted and provided with a website link to access the report. You may elect to receive all future reports in paper free of charge. If you hold accounts directly with BlackRock, you can call (800) 441-7762 to inform BlackRock that you wish to continue receiving paper copies of your shareholder reports. If you hold accounts through a financial intermediary, you can follow the instructions included with this disclosure, if applicable, or contact your financial intermediary to request that you continue to receive paper copies of your shareholder reports. Please note that not all financial intermediaries may offer this service. Your election to receive reports in paper will apply to all funds advised by BlackRock Advisors, LLC, BlackRock Fund Advisors or their affiliates, or all funds held with your financial intermediary, as applicable. If you already elected to receive shareholder reports electronically, you will not be affected by this change and you need not take any action. You may elect to receive electronic delivery of shareholder reports and other communications by: (i) accessing the BlackRock website at edelivery and logging into your accounts, if you hold accounts directly with BlackRock, or (ii) contacting your financial intermediary, if you hold accounts through a financial intermediary. Please note that not all financial intermediaries may offer this service. This Summary Prospectus contains information you should know before investing, including information about risks. Please read it before you invest and keep it for future reference. The Securities and Exchange Commission has not approved or disapproved these securities or passed upon the adequacy of this Summary Prospectus. Any representation to the contrary is a criminal offense.

Not FDIC Insured ? May Lose Value ? No Bank Guarantee

Summary Prospectus

Key Facts About BlackRock Short-Term Municipal Fund

Investment Objective

The investment objective of BlackRock Short-Term Municipal Fund (the "Short-Term Fund" or the "Fund") is to provide shareholders with as high a level of income exempt from Federal income taxes as is consistent with the investment policies of the Fund.

Fees and Expenses of the Fund

This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund. You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in the fund complex advised by BlackRock Advisors, LLC ("BlackRock") or its affiliates. More information about these and other discounts is available from your financial professional or your selected securities dealer, broker, investment adviser, service provider or industry professional (including BlackRock and its affiliates) (each a "Financial Intermediary") and in the "Details About the Share Classes" and the "Intermediary-Defined Sales Charge Waiver Policies" sections on pages 41 and A-1, respectively, of the Fund's prospectus and in the "Purchase of Shares" section on page II-86 of Part II of the Fund's Statement of Additional Information.

Shareholder Fees (fees paid directly from your investment)

Maximum Sales Charge (Load) Imposed on Purchases (as percentage of offering price)

Maximum Deferred Sales Charge (Load) (as percentage of offering price or redemption proceeds, whichever is lower)

Investor A Shares

3.00%

None1

Investor C Shares

None

1.00%2

Institutional Shares

None

None

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

Investor A Shares

Investor C Shares

Institutional Shares

Management Fee3

0.29%

0.29%

0.29%

Distribution and/or Service (12b-1) Fees

0.25%

1.00%

None

Other Expenses

0.11%

0.14%

0.17%

Total Annual Fund Operating Expenses

0.65%

1.43%

0.46%

Fee Waivers and/or Expense Reimbursements3,4

(0.04)%

(0.07)%

(0.10)%

Total Annual Fund Operating Expenses After Fee Waivers and/or Expense Reimbursements3,4

0.61%

1.36%

0.36%

1 A contingent deferred sales charge ("CDSC") of 0.25% is assessed on certain redemptions of Investor A Shares made within 9 months after purchase where no initial sales charge was paid at the time of purchase as part of an investment of $250,000 or more. With respect to shares purchased on or after March 18, 2019 and prior to July 1, 2020, a CDSC of 0.25% is assessed on certain redemptions of Investor A Shares made within 9 months after purchase where no initial sales charge was paid at the time of purchase as part of an investment of $100,000 or more. With respect to shares purchased prior to March 18, 2019, a CDSC of 0.50% is assessed on certain redemptions of Investor A Shares made within 18 months after purchase where no initial sales charge was paid at the time of purchase as part of an investment of $250,000 or more.

2 There is no CDSC on Investor C Shares after one year.

3 As described in the "Management of the Funds" section of the Fund's prospectus beginning on page 57, BlackRock has contractually agreed to waive the management fee with respect to any portion of the Fund's assets estimated to be attributable to investments in other equity and fixedincome mutual funds and exchange-traded funds managed by BlackRock or its affiliates that have a contractual management fee, through October 31, 2021. In addition, BlackRock has contractually agreed to waive its management fees by the amount of investment advisory fees the Fund pays to BlackRock indirectly through its investment in money market funds managed by BlackRock or its affiliates, through October 31, 2021. The contractual agreements may be terminated upon 90 days' notice by a majority of the non-interested directors of BlackRock Municipal Bond Fund, Inc. (the "Corporation") or by a vote of a majority of the outstanding voting securities of the Fund.

4 As described in the "Management of the Funds" section of the Fund's prospectus beginning on page 57, BlackRock has contractually agreed to waive and/or reimburse fees or expenses in order to limit Total Annual Fund Operating Expenses After Fee Waivers and/or Expense Reimbursements (excluding Dividend Expense, Interest Expense, Acquired Fund Fees and Expenses and certain other Fund expenses) to 0.61% (for Investor A Shares), 1.36% (for Investor C Shares) and 0.36% (for Institutional Shares) of average daily net assets through October 31, 2021. The contractual agreement may be terminated upon 90 days' notice by a majority of the non-interested directors of the Corporation or by a vote of a majority of the outstanding voting securities of the Fund.

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