Exhibit 1(i)

                          ARTICLES SUPPLEMENTARY TO THE

                          ARTICLES OF INCORPORATION OF

                     MERRILL LYNCH MUNICIPAL BOND FUND, INC.

      MERRILL  LYNCH   MUNICIPAL  BOND  FUND,  INC.   (hereinafter   called  the
Corporation),  a Maryland  corporation,  registered  as an  open-end  investment
company under the Investment Company Act of 1940 and having its principal office
in the City of Baltimore,  Maryland, hereby certifies to the State Department of
Assessments and Taxation of Maryland that:

      FIRST:  The  Board of  Directors  of the  Corporation  at a  meeting  duly
convened  and held on March 27, 1990  adopted a resolution  in  accordance  with
Section  2-105(c) of the General  Corporation  Law of Maryland,  to increase the
total number of shares of capital stock of the Insured Portfolio,  designated as
Class A, which the  Corporation  shall have  authority  to issue to FIVE HUNDRED
MILLION (500,000,000) shares of the par value of Ten Cents ($0.10) per share and
of the aggregate par value of Fifty Million Dollars ($50,000,000).

      SECOND:  The  total  number  of  shares  of all  classes  of  stock of the
Corporation heretofore authorized, and the number and par value of the shares of
each class as follows:

      One Billion Eight Hundred Million  (1,800,000,000) shares of capital stock
      of the par value of ten cents  ($0.10) per share and of the  aggregate par
      value of One Hundred Eighty Million Dollars  ($180,000,000),  divided into
      three series,  two of which are divided into two classes each. The classes
      of Common Stock  designated  as the Insured  Portfolio  and the High Yield
      Portfolio consist of 750,000,000  shares each, which are each divided into
      375,000,000  shares  of Class A and  375,000,000  shares of Class B Common
      Stock.  The class of  Common  Stock  designated  as the  Limited  Maturity
      portfolio consists of 300,000,000 shares of a single class.

      THIRD:  The  total  number  of  shares  of all  classes  of  stock  of the
Corporation  as  increased,  and the  number and par value of the shares of each
class, are as follows:

      The  class of Common  Stock  designated  as the  Insured  Portfolio  shall
      consist  of  875,000,000  shares of the par value of Ten Cents  ($.10) per
      share divided into 500,000,000 shares of Class A and 375,000,000 shares of
      Class B Common  Stock.  The class of Common Stock  designated  as the High
      Yield  Portfolio  shall consist of 750,000,000  shares of the par value of
      Ten  Cents  ($.10)  per  share  divided  into  375,000,000   Class  A  and
      375,000,000  Class B shares of  Common  Stock.  The class of Common  Stock
      designated as the Limited Maturity  Portfolio shall consist of 300,000,000
      shares of the par value of Ten Cents ($.10) per share of a single class.


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      FOURTH:  The aforesaid action by the Board of Directors was taken pursuant
to authority and power contained in the Charter of the Corporation.

      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  President and
attested by its Secretary on May 21, 1990.

                                       MERRILL LYNCH MUNICIPAL BOND FUND, INC.


                                       By:  /s/ Arthur Zeikel
                                          -------------------------
                                            Arthur Zeikel
                                            President

Attest:


/s/ Mark B. Goldfus
-----------------------------
Mark B. Goldfus
Secretary


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      The undersigned, President of MERRILL LYNCH MUNICIPAL BOND FUND, INC., who
executed on behalf of said Corporation the foregoing Articles Supplementary,  of
which this certificate is made a part, hereby  acknowledges,  in the name and on
behalf of said  Corporation,  the  foregoing  Articles  Supplementary  to be the
corporate act of said corporation and further certifies that, to the best of his
knowledge,  information and belief, the matters and facts set forth therein with
respect to the  approval  thereof are true in all material  respects,  under the
penalties of perjury.


                                       By:  /s/ Arthur Zeikel
                                          -------------------------
                                            Arthur Zeikel
                                            President


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