+* comments_shown_pagespec: pages where comments will be displayed inline, e.g. `blog/*`
+ or `*/discussion`.
+* comments_open_pagespec: pages where new comments can be posted, e.g.
+ `blog/* and created_after(close_old_comments)` or `*/discussion`
+* comments_pagename: if this is e.g. `comment_` (the default), then comments on the
+ [[sandbox]] will be called something like `sandbox/comment_12`
+* comments_allowdirectives: if true (default false), comments may contain IkiWiki
+ directives
+* comments_commit: if true (default true), comments will be committed to the version
+ control system