Definition of Expository Statute
A law that is enacted to explain the meaning of a previously enacted law. Such statutes are often expressed thus: “The true intent and meaning of an act passed * * * be and is hereby declared to be”; “the provisions of the act shall not hereafter extend”; or “are hereby declared and enacted not to apply", and the like. This is a common mode of legislation.
That's the definition of Expository Statute in Black's Law Dictionary 6th Edition. Courtesy of Cekhukum.com.