addendum

This term describes a supplementary piece of writing that is appended to a primary document. It carries a formal, administrative, or academic tone, suggesting that the original work was complete but required a specific update or expansion to maintain accuracy or legality. In legal contexts, it functions as a binding modification to a contract without requiring the entire document to be rewritten. Because it is a Latin loanword, it follows specific pluralization patterns that differ from standard English nouns.