Iowa Code § 491.27: Execution of renewal — record required.

After the action of the stockholders for the renewal of any corporation, a certificate, showing the proceedings resulting in the renewal, sworn to by the president and secretary of the corporation, or by other officers as may be designated by the stockholders, together with the articles of incorporation, which may be the original articles of incorporation or amended and substituted articles, shall be filed with the secretary of state and be recorded by the secretary in a book kept for that purpose.