addendum.

A section or document added to a completed work to supply more information or a correction.

Use it for

Words that belong together

• contract addendum
• addendum to a report

On the page

An addendum clarified which costs had been excluded.

Usage notes

Primary category: academic / formal. Forms: Singular addendum; plural addenda or addendums. Legacy lexical fields mirror sense 1 only. Use numbered sense fields for all meanings. Established modern English lexical item. No separate regional spelling or grammatical inflection entry. Commonness: moderately common.