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addendum (noun) addition, an extra section in a book (appendix).
If a book has an extra section attached for giving extra information related to the text, it is an addendum. A dictionary may have an addenda (plural) with information about the capitals and currencies of countries, games, etc..
- The addendum to the book, oddly enough, gives more interesting information than the main part of the book.
- The addendum is just a repetition, though brief, of some of the information in the main part of the book.