S.D. Codified Laws § 11-6-18
The adoption by the municipal council of the plan or any part, amendment or additions, shall, following the same type of notice and public hearing as required by § 11-6-17, be by resolution carried by the affirmative votes of not less than a majority of all the members of the council. The resolution shall refer expressly to the maps, descriptive matter, and other matters intended by the council to form the whole or part of the plan, and the action taken shall be recorded on the adopted plan or part thereof, by the identifying signature of the mayor of the municipality. If a zoning ordinance is included as an adjunct to the comprehensive plan, or any part, amendment or addition, that zoning ordinance shall be subject to the provisions of § 11-4-5.
SDCL 11-6-18