* Accessor/initialisation for mRestrictions
*
* @param string $action Action that permission needs to be checked for
- * @return array Restriction levels needed to take the action. All levels
- * are required.
+ * @return array Restriction levels needed to take the action. All levels are
+ * required. Note that restriction levels are normally user rights, but 'sysop'
+ * and 'autoconfirmed' are also allowed for backwards compatibility. These should
+ * be mapped to 'editprotected' and 'editsemiprotected' respectively.
*/
public function getRestrictions( $action ) {
if ( !$this->mRestrictionsLoaded ) {