Translations:Help:Tracking categories/2/en

What category to use is determined by the tracking category's 1>m:Help:System message|system message (i.e. a page in MediaWiki namespace). If the message is a single dash (-), then the tracking category is disabled. Often such categories are marked as hidden ( __HIDDENCAT__ ) as they are meant for maintenance and not general consumption. Some sites use 3>Extension:Parser functions|Parser functions to modify which category is used based on namespace, but that doesn't work properly until 1.19.