Manual:CategoryMembershipChanges

Catwatch is a new MediaWiki feature that tracks category membership changes. It is possible to view these changes in the recent changes and watch lists.

Enabling the feature on a wiki
The feature is currently controlled using the $wgRCWatchCategoryMembership global which is by default set to false.

To enable the feature set this to true!

Even when enabled on a wiki the default settings hide the category membership changes from users.

Showing the changes
To show the changes on either recent changes or a watchlist change un-hide "page categorization"s

Showing the feature by default (per user)
There are 2 user preferences that currently hide the feature by default.

To show the changes be default head to your user preferences and change the settings!