Exhibit 1(s)

                     MERRILL LYNCH MUNICIPAL BOND FUND, INC.

                              ARTICLES OF AMENDMENT


      MERRILL LYNCH MUNICIPAL BOND FUND, INC., a Maryland corporation (the
"Corporation"), does hereby certify to the State Department of Assessments and
Taxation of Maryland that:

      FIRST: The Corporation desires to amend its charter as currently in
effect.

      SECOND: Pursuant to Section 2-605 of the Maryland General Corporation Law,
the charter of the Corporation is hereby amended by renaming the applicable
issued and unissued shares of capital stock of the Corporation as set forth
below:

 Current Name of Series and Class               New Name of Series and Class
 --------------------------------               ----------------------------

Insured Portfolio                            BlackRock Municipal Insured Fund
    Class A Common Stock                         Investor A Common Stock
    Class B Common Stock                         Investor B Common Stock
    Class C Common Stock                         Investor C1 Common Stock
    Class I Common Stock                         Institutional Common Stock

National Portfolio                           BlackRock National Municipal Fund
    Class A Common Stock                         Investor A Common Stock
    Class B Common Stock                         Investor B Common Stock
    Class C Common Stock                         Investor C1 Common Stock
    Class I Common Stock                         Institutional Common Stock

Short-Term Portfolio                         BlackRock Short-Term Municipal Fund
    Class A Common Stock                         Investor A1 Common Stock
    Class B Common Stock                         Investor B Common Stock
    Class C Common Stock                         Investor C1 Common Stock
    Class I Common Stock                         Institutional Common Stock

High Yield Portfolio                         BlackRock High Yield Municipal Fund
    Investor A Common Stock                      Investor A Common Stock
    Investor C Common Stock                      Investor C Common Stock
    Institutional Common Stock                   Institutional Common Stock

      THIRD: (i) The Investor A Common Stock shall retain the same preferences,
conversions and other rights, voting powers, restrictions, limitations as to
dividends, qualifications, and terms and conditions of redemption of the former
Class A Common Stock;

      (ii) The Investor A1 Common Stock of the BlackRock Short-Term Municipal
      Fund shall retain the same preferences, conversions and other rights,
      voting powers,



      restrictions, limitations as to dividends, qualifications, and terms and
      conditions of redemption of the former Class A Common Stock;

      (iii) The Investor B Common Stock shall retain the same preferences,
      conversions and other rights, voting powers, restrictions, limitations as
      to dividends, qualifications, and terms and conditions of redemption of
      the former Class B Common Stock;

      (iv) The Investor C1 Common Stock shall retain the same preferences,
      conversions and other rights, voting powers, restrictions, limitations as
      to dividends, qualifications, and terms and conditions of redemption of
      the former Class C Common Stock; and

      (v) The Institutional Common Stock shall retain the same preferences,
      conversions and other rights, voting powers, restrictions, limitations as
      to dividends, qualifications, and terms and conditions of redemption of
      the former Class I Common Stock.

      THIRD: These Articles of Amendment have been approved by a majority of the
entire Board of Directors of the Corporation and are limited to a change
expressly authorized by Section 2-605 of the Maryland General Corporation Law
and are therefore made without action by the stockholders.

      FOURTH: The authorized capital stock of the Corporation has not been
increased by these Articles of Amendment.

      FIFTH: As amended hereby, the Corporation's charter shall remain in full
force and effect.

      SIXTH: These Articles of Amendment shall be effective as of the 29th day
of September, 2006.


                                       2


      IN WITNESS WHEREOF, MERRILL LYNCH MUNICIPAL BOND FUND, INC. has caused
these presents to be signed in its name and on its behalf by its Vice President
and witnessed by its Secretary as of the __ day of September, 2006.


                                        MERRILL LYNCH MUNICIPAL BOND FUND, INC.


                                        By:
                                             -----------------------------------
                                             Donald C. Burke, Vice President

Witness:

---------------------------------
Alice A. Pellegrino, Secretary

      THE UNDERSIGNED, Vice President of the Corporation, who executed on behalf
of the Corporation the foregoing Articles of Amendment of which this certificate
is made a part, hereby acknowledges in the name and on behalf of the Corporation
the foregoing Articles of Amendment to be the corporate act of the Corporation
and further certifies, as to all of the matters and facts required to be
verified under oath, that to the best of his knowledge, information and belief,
the matters and facts set forth herein are true in all material respects, under
the penalties of perjury.

                                             -----------------------------------
                                             Donald C. Burke, Vice President


                                       3