the.com/addendum

The afterthought important enough to survive the final edit.

means A piece of extra material added to the end of a document, often to fix an omission after the main text was already considered finished.

from Straight from Latin addendum, meaning 'a thing to be added' — the gerundive form of addere, 'to add.' That same root gives us 'add' and 'addition.' The plural, addenda, still shows up in formal writing for multiple afterthoughts, which is a tidy bit of grammar doing the humble work of saying 'oh, also this.'

plural form
addenda, if you want to sound insufferable
legal use
adds terms without reopening the whole contract
psychology
reveals what the author wished they'd said first
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