Mississippi Code Title 91. Trusts and Estates § 91-5-11

(1) A devise or bequest in a will duly executed pursuant to the provisions of Section 91-5-1 of Mississippi Code of 1972 may be made to the trustee of a trust which is evidenced by a written instrument in existence when the will is made and which is identified in the will. Such devise or bequest shall not be invalid because the trust is amendable or revocable, or both, by the settlor or any other person or persons; nor because the trust instrument or any amendment thereto was not executed in the manner required for wills; nor because the trust was amended after execution of the will. Unless the will provides otherwise, such devise or bequest shall operate to dispose of the property under the terms and provisions of the instrument creating the trust, including any amendments or modifications in writing made at any time before or after the making of the will and before the death of the testator, and the property shall not be deemed held under a testamentary trust. An entire revocation of the trust prior to the testator's death shall invalidate the devise or bequest.

(2) The provisions of this section shall apply to all devises or bequests made in any will duly executed according to said section of any testator dying after May 6, 1958, whether the will is executed before or after that date.

(3) The term “will” in this section shall include and refer to the term “codicil”.