Mich. Comp. Laws § 556.125

Sec. 15. When the creator of a trust reserves to himself an unqualified power to amend or revoke, the period during which the vesting of a future interest may be suspended or postponed begins when the unqualified power to amend or revoke terminates, whether by reason of the death of the trust creator, by release or otherwise; or on the effective date of the instrument exercising the power to revoke.