--- /dev/null
+The classes in this directory are general utilities for use by any part of
+MediaWiki. They do not favour any particular user interface and are not
+constrained to serve any particular feature. This is similar to includes/libs,
+except that some dependency on the MediaWiki framework (such as the use of
+MWException, Status or wfDebug()) disqualifies them from use outside of
+MediaWiki without modification.
+
+Utilities should not use global configuration variables, rather they should rely
+on the caller to configure their behaviour.