commentation

commentation (countable and uncountable, plural commentations)

1. The act of making comments.[1]
   • 1837, William Whewell, “The Commentatorial Spirit of the Middle Ages”, in History of the Inductive Sciences, from the Earliest to the Present Times. […], volume I, London: John W[illiam] Parker, […]; Cambridge, Cambridgeshire: J. and J. J. Deighton, →OCLC, book IV (History of the Physical Sciences in the Middle Ages), page 268:

     The spirit of commentation, as has already been suggested, turns to questions of taste, of metaphysics, of morals, with far more avidity to physics.

2. The work of a commentator.
3. (programming) The use of comments in source code.
   • 1997, Case Studies in Algorithms and Programming‎:

     In-program commentation is another level of documentation that is compulsory, with standards being set regarding what should be included in source code.