1) Add commentaries 2) Add comments to 3) Add footnotes 4) Add to marginally 5) Bolster a classic 6) Clutter up page margins 7) Compose 8) Expound upon in writing 9) Footnote 10) Furnish explanatory comment 11) Furnish literary commentary 12) Gloss 13) Indite 14) Make a literary aside 15) Make a margin comment 1) Gloss 
• (v. i.) To make notes or comments; -- with on or upon. • (n.) To explain or criticize by notes; as, to annotate the works of Bacon.
An'no·tate intransitive verb To make notes or comments; -- with on or upon . An'no·tate transitive verb [ imperfect & past participle Annotated ; present participle & verbal noun Annotating .] [ Latin annotatus ; past participle of annotare to annotate; ad + notare to mark, nota
Annotate: In genetics, to identify the locations and the coding regions of genes in a genome and determine what those genes do. To annotate (irrespective of the context) is to add a note by way of explanation or commentary. Once a genome is sequenced, it needs to be annotated to make sense of it.
[v] - add explanatory notes to or supply with critical comments`The scholar annotated the early edition of a famous novel`
verb provide interlinear explanations for words or phrases; `He annotated on what his teacher had written`footnote verb add explanatory notes to or supply with critical comments; `The scholar annotated the early edition of a famous novel`