liner note

[lahy-ner noht]
noun
  1. Usually liner notes. explanatory or interpretative notes about an audio album, as a record, CD, etc., printed on the cover or case or otherwise provided.

Origin of liner note

An Americanism dating back to 1950–55
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018