Tex. Bus. & Com. Code § 7.506
The transferee of a negotiable tangible document of title has a specifically enforceable right to have its transferor supply any necessary indorsement, but the transfer becomes a negotiation only as of the time the indorsement is supplied.
Acts 1967, 60th Leg., p. 2343, ch. 785, Sec. 1, eff. Sept. 1, 1967.
Acts 2005, 79th Leg., Ch. 122 (S.B. 1593), Sec. 1, eff. September 1, 2005.