Addendum
Encyclopedia : A : AD : ADD : Addendum
An addendum is an oft-supplemental addition to a given main work. It may correct errors, explain inconsistencies or otherwise detail or update the information found in the main work, especially if any such problems were detected too late to correct the main work. For example, the main work could have had already been printed and the cost of destroying the batch and reprinting is deemed too high.
As such, addenda may come in many forms — a separate letter included with the work, text files on digital medium, or any similar carrier.
See also
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