Mich. Comp. Laws § 552.43: Divorce from bed and board; decree; limited time, revocation.

Sec. 43.

When a decree of divorce from bed and board forever, or for a limited time, shall have been pronounced, it may be revoked at any time thereafter, under such regulations and restrictions as the court may impose, upon the joint application of the parties, and their producing satisfactory evidence of their reconciliation.