Mass. Gen. Laws ch. 158, § 11

A corporation may, by a vote of all its stockholders at a meeting duly called for the purpose, alter, add to or change the business for the transaction of which it was incorporated, but it shall not engage in any business which is not authorized by law. A certificate setting forth such alteration, addition or change, signed and sworn to by the president, treasurer and a majority of the directors, shall be filed in the office of the state secretary.