Mich. Comp. Laws § Article VI § 6: Decisions and dissents; writing, contents.

Sec. 6.

Decisions of the supreme court, including all decisions on prerogative writs, shall be in writing and shall contain a concise statement of the facts and reasons for each decision and reasons for each denial of leave to appeal. When a judge dissents in whole or in part he shall give in writing the reasons for his dissent.