+* `comments_allowauthor`: if true (default false), anonymous commenters may specify a
+ name for themselves, and the \[[!meta author]] and \[[!meta authorurl]] directives
+ will not be overridden by the comments plugin
+
+Templates that will display comments (by default that means `comments_display.tmpl`)
+can use the following additional `<TMPL_VAR>`s:
+
+* `COMMENTUSER`: the authenticated/verified user name, or undefined if the user was not signed in
+* `COMMENTIP`: the remote IP address, or undefined if not known (this is not currently recorded
+ for users who are signed in, who are assumed to be vaguely accountable)
+* `COMMENTAUTHOR`: a "prettier" version of the authenticated/verified user name (e.g. OpenIDs are
+ formatted the same way as in [[RecentChanges]]), or the result of localizing "Anonymous" if the
+ user was not signed in
+* `COMMENTAUTHORURL`: if the user was signed in with an OpenID, that URL; if the user was signed
+ in with some other username, a CGI URL that redirects to their user page (if any)
+
+This plugin also adds a `\[[!comment]]` directive which is used when storing comments. This
+directive shouldn't be used on pages that are edited in the usual way.