annotation
nounUK /ˌænəˈteɪʃən/
US /ˌænəˈteɪʃən/
A note you add to a book or picture to explain something.
She wrote an annotation in the margin next to the difficult word.
RELATED WORDS
OTHER MEANINGS
2. The act of adding notes or comments to a text or document.
The teacher spent the evening on the annotation of her students' essays.
3. A critical or explanatory note added to a literary work.
The scholar's annotations helped readers understand the old poem.
4. In computing, extra information attached to data to describe it.
The programmer added an annotation to the code to explain its purpose.