Etymology
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addendum (n.)

1794, "an appendix to a work; a thing to be added," literally "something added," from Latin addendum, neuter of addendus "that which is to be added," gerundive of addere "add to, join, attach" (see add (v.)). Classical plural form is addenda.

updated on October 28, 2016

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Definitions of addendum from WordNet

addendum (n.)
textual matter that is added onto a publication; usually at the end;
Synonyms: supplement / postscript
From wordnet.princeton.edu, not affiliated with etymonline.