MediaWiki:Apihelp-compare-paramvalue-prop-comment
From MoodleDocs
The comment on the 'from' and 'to' revisions. If the comment has been revision deleted, a fromcommenthidden or tocommenthidden property will be returned.
Note: You are currently viewing documentation for Moodle 3.1. Up-to-date documentation for the latest stable version of Moodle is probably available here: Apihelp-compare-paramvalue-prop-comment.