annotation
noun
[ anəˈteɪʃ(ə)n ]
• a note by way of explanation or comment added to a text or diagram.
• "marginal annotations"
Similar:
note,
notation,
comment,
gloss,
footnote,
commentary,
explanation,
interpretation,
observation,
elucidation,
explication,
exegesis,
Origin:
late Middle English: from French, or from Latin annotatio(n- ), from the verb annotare (see annotate).