documentation

noun[in the plural]5

1. •
   Documentary evidence and sources.
2. •
   Documents that explain the operation of a particular machine or software program.
3. •
   Comments that explain the usage of individual functions, libraries and blocks of code.
4. •
   A documentary.

   • Yesterday I watched a documentation about the Dresden fire storm. — 1999
5. •
   (rare) Something transposed from a thought to a document; the written account of an idea.