Mich. Comp. Laws § 565.351: Land contract; acknowledgment; endorsement.

Sec. 1.

A contract for the sale of land or any interest in that land shall be executed by the vendor named in the contract, and acknowledged before any judge or before any notary public within this state, and the officer taking the acknowledgment shall endorse a certificate of the acknowledgment and the date of making the acknowledgment under his or her hand.