A corporation may amend its articles of incorporation at any time to add or change a provision that is required or permitted in the articles or to delete a provision not required in the articles. Whether a provision is required or permitted in the articles is determined as of the effective date of the amendment.
Authority To Amend
Mont. Code Ann. § 35-2-221, under Formation -- Articles of Incorporation Bylaws -- Amendments.
Mont. Code Ann. § 35-2-221