This is a tracking category. It is used to build and maintain lists of pages—primarily for the sake of the lists themselves and their use in article and category maintenance. It is not part of the encyclopedia's categorization scheme. More information: This category is hidden on its member pages—unless the corresponding user preference is set. These categories are used to track, build and organize lists of pages needing "attention en masse" (for example, pages using deprecated syntax), or that may need to be edited at someone's earliest convenience. These categories also serve to aggregate members of several lists or sub-categories into a larger, more efficient list (discriminated by classifications).

This category is not shown on its member pages unless the appropriate user preference is set.

Administrators: Please do not delete this category even if it is empty! This category may be empty occasionally or even most of the time.

This is a Wikipedia maintenance category.

This category is automatically populated by the template ((documentation)). It detects and reports some types of strange usage. This is so we can easily find those pages and fix them.

The most common fixes that need to be done are:

• The ((documentation)) template itself is used on a /doc or /testcases subpage (except in Module namespace). Fix it by removing the ((documentation)) template from the subpage. But there are some cases where a template is used to create documentation, and then it is correct that it shows documentation on the /testcases page.

Subcategories that get listed here are not subcategories in the normal sense. Instead they happen to use the ((documentation)) box and thus need fixing too.

MediaWiki runs updates of category listings (as the one you see below) as a low priority job. Thus if the servers are very busy it can take some days before a page is removed from the list below even though the page has been fixed. But normally it is removed within an hour.

Sometimes you need to purge a page to see your fix and to get rid of this category from the bottom of a page.

For more about this see Template talk:Documentation.