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1794, literally something added, from Latin addendum, neuter of addendus that which is to be added, gerundive of addere (see add (v.)). Classical plural form is addenda.
Appendix and addendum are similar in that both can be short sections at the end of a book. However, they contain different kinds of information, and they are there for different reasons. Appendix. An appendix is a section of extra information that is useful to the reader.