Ohio Rev. Code § 5804.18: When certain trust is irrevocable.

A trust described in 42 U.S.C. 1396p(d)(4) is irrevocable if the terms of the trust prohibit the settlor from revoking it, whether or not the settlor's estate or the settlor's heirs are named as the remainder beneficiary or beneficiaries of the trust upon the settlor's death.