Iowa Const. art. X, § 1

Any amendment or amendments to this Constitution may be proposed in either house of the general assembly; and if the same shall be agreed to by a majority of the members elected to each of the two houses, such proposed amendment shall be entered on their journals, with the yeas and nays taken thereon, and referred to the legislature to be chosen at the next general election, and shall be published, as provided by law, for three months previous to the time of making such choice; and if, in the general assembly so next chosen as aforesaid, such proposed amendment or amendments shall be agreed to, by a majority of all the members elected to each house, then it shall be the duty of the general assembly to submit such proposed amendment or amendments to the people, in such manner, and at such time as the general assembly shall provide; and if the people shall approve and ratify such amendment or amendments, by a majority of the electors qualified to vote for members of the general assembly, voting thereon, such amendment or amendments shall become a part of the Constitution of this state.