Manual talk:User former groups table

"This is used to keep MediaWiki from automatically adding users to groups from which he has been manually removed before." When would MediaWiki automatically add a user to a group? Leucosticte (talk) 07:36, 30 September 2012 (UTC)
 * For example autoconfirmed group --wargo (talk) 08:53, 30 September 2012 (UTC)