What does annotate mean?
The definition of annotate
An”no*tate, v. t.
[imp. & p. p. Annotated; p. pr. & vb. n.Annotating.]
Etym: [L. annotatus; p. p. of annotare to annotate; ad + notare to mark, nota mark. See Note, n.]

To explain or criticize by notes; as, to annotate the works of Bacon.

An”no*tate, v. i.
To make notes or comments; — with on or upon.