Constitution of the State of Texas 1876 Art. 11, § 13. Classification of municipal functions

(a) Notwithstanding any other provision of this constitution, the legislature may by law define for all purposes those functions of a municipality that are to be considered governmental and those that are proprietary, including reclassifying a function's classification assigned under prior statute or common law.

(b) This section applies to laws enacted by the 70th Legislature, Regular Session, 1987, and to all subsequent regular or special sessions of the legislature.