Ind. Code § 8-4-2-4
If at such special or annual meeting of the stockholders, said amendments, or any of them, be submitted to a vote, and if it shall appear that votes representing a majority (or such greater proportion as said articles may require) of all the outstanding stock of each class of said company are cast in favor of the approval of said amendments or any of them, as submitted by the directors or as altered by the stockholders' meeting, a certificate setting forth such amendments as adopted and the approval thereof, verified by the affidavit of the president or vice-president and under the corporate seal of said company shall be filed in the office of the secretary of state, and thereupon the amendment or amendments so approved at such meeting of the stockholders shall be, and are hereby declared, accomplished, and the articles of association or consolidation of said company shall be deemed to be amended in accordance with said vote of the stockholders.
IC 8-4-2-4