purposes (e.g., the classification code or file
 number assigned to the record, its draft) [Archives] 
n., Information, especially explanatory notes, added to a completed document. [Archives] 
n., Notes added as comment or explanation. [Arts] 
n., A brief note, usually no longer than two or three sentences, added after a citation in a bibliography to describe or explain the
content or message of the work cited or to comment on it. 
Example: 
Bradbury, Malcolm, ed. The Atlas of Literature. London: De Agostin