La. Stat. tit. 33 § 1181
When a municipality existing prior to July 29, 1898, and having a population of two hundred thousand or less, which has not come under the provisions of Part I of Chapter 2 of this Title, desires to amend its charter, the same may be done in this way: The municipal governing body may prepare, in writing, the desired amendments, have the same published for three weeks in a newspaper published in the municipality, if there be one, and, if none, then by posting for said time in at least three public places therein; the proposed amendments shall then be submitted to the governor, who shall submit them to the Attorney General for his opinion. If the Attorney General is of the opinion that the proposed amendments are consistent with the constitution and laws of the United States and of this state, including Part I of Chapter 2 of this Title, the Governor shall approve the proposed amendments. If, within thirty days after publication, one-tenth of the electors of the municipality protest against any proposed amendment, the Governor shall not approve the amendment protested against until it is submitted to and ratified by a majority of the electors of the municipality at an election held within sixty days after the protest has been made.
Amendments, when approved by the Governor, shall be recorded at the expense of the municipality, in the office of the Secretary of State and upon the records of the municipal governing body, and, when so recorded, shall have the force and effect of law.
La. R.S. § 33:1181