Indiana Code Title 36. Local Government § 36-7-4-509

Sec. 509. (a) ADVISORY--AREA.  After certification of the comprehensive plan, the legislative body may adopt a resolution approving, rejecting, or amending the plan.  Such a resolution requires only a majority vote of the legislative body, and is not subject to approval or veto by the executive of the adopting unit, and the executive is not required to sign it.

(b) ADVISORY--AREA.  The comprehensive plan is not effective for a jurisdiction until it has been approved by a resolution of its legislative body.  After approval by resolution of the legislative body of the unit, it is official for each unit that approves it.  Upon approval of the comprehensive plan by the legislative body, the clerk of the legislative body shall place one (1) copy of the comprehensive plan on file in the office of the county recorder.