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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.
An addendum, in general, is an addition required to be made to a document by its author subsequent to its printing or publication.It comes from the Latin verbal phrase addendum est, being the gerundive form of the verb addo, addere, addidi, additum, to give to, add to, meaning (that which) must be added.n other documents, most importantly in legal contracts, an addendum is an additional document not included in the main part of the contract. It is an ad hoc item, usually compiled and executed after the main document, which contains additional terms, obligations or information.