Louisiana Revised Statutes Tit. 9, § 2051. Form

A. A modification, division, termination, or revocation of a trust shall be by authentic act or by act under private signature executed in the presence of two witnesses and duly acknowledged by the person who makes the modification, division, or termination or by the affidavit of one of the attesting witnesses. The modification, division, termination, or revocation is not effective as to a trustee until a copy of the authentic act or a copy of the acknowledged act is received by him.

B. A modification, division, termination, or revocation of a trust may also be by testament. Such a modification, division, termination, or revocation is not effective as to a trustee until the trustee receives a copy of the testament and of the order probating it or ordering it filed and executed.