What is another word for companion paper?
Pronunciation: [kəmpˈani͡ən pˈe͡ɪpə] (IPA) 
A companion paper is a secondary document that is published alongside a primary paper to provide additional context, analysis or information related to the primary research. Synonyms for the term "companion paper" include supplementary material, supporting documentation, accompanying report, supplemental report, annex, appendix, and addendum. These synonyms convey the same idea of a document that complements or enhances another primary document. Companion papers are often used in scientific research, where they are used to provide additional data, methodology, and explanations for the primary paper. They are also commonly used in the world of journalism, where they can serve as background research or additional analysis on a news story.
