The zoning ordinance, including the maps, may from time to time be amended; but no amendment shall become effective unless it is first submitted to and approved by the planning commission or, if disapproved, receives the favorable vote of a majority of the entire membership of the chief legislative body.
Amendments to zoning ordinances
Tenn. Code Ann. § 13-7-204, under Municipal Zoning.
Tenn. Code Ann. § 13-7-204