Louisiana constitution
Article 13
Section 1

(C) Ratification. If a majority of the electors voting on the proposed amendment approve it, the governor shall proclaim its adoption, and it shall become part of this constitution, effective twenty days after the proclamation, unless the amendment provides otherwise. A proposed amendment directly affecting not more than five parishes or areas within not more than five parishes shall become part of this constitution only when approved by a majority of the electors voting thereon in the state and also a majority of the electors voting thereon in each affected parish. However, a proposed amendment directly affecting not more than five municipalities, and only such municipalities, shall become part of this constitution only when approved by a majority of the electors voting thereon in the state and also a majority of the electors voting thereon in each such municipality.