to annotate, to add explanatory notes

gloss, explanatory notes, annotation

(archaic) a document / (archaic) (in palaeography) a written text between two parties

a document / (in palaeography) a written text between two parties

a document, a written record / a letter, an epistle

(archaic) the act of writing of a letter or correspondence / (archaic) the writing in a letter or correspondence, especially the style or appearance

he / distal demonstrative, something far off removed from both speaker and listener: that / boyfriend

distal demonstrative, something far off removed from both speaker and listener: that, yon / particularly, male personal third person pronoun: he / by extension from he: boyfriend

he; boyfriend

attach, affix, stick, fasten, add, add on, append; set, put, put one thing on another / apply, put on / leave a mark on / write, make an entry / give, impart, direct, direct one's attention