Expository adj. Pertaining to, or containing, exposition; serving to explain; explanatory; illustrative; exegetical. "A glossary or expository index to the poetical writers."
... the leading objects kept in view have been—first, an expository outline of the author's facts and argument; next, of the chief reasons by which they have been impugned by Professor SEDGWICK, Professor WHEWELL, Mr. BOSANQUET, and others who have entered the lists of ... — An Expository Outline of the "Vestiges of the Natural History of Creation" • Anonymous
...
