*
* @param int $userId ID of the user to search for
* @param IDatabase|null $db Optional database connection
- * @return array Associative array of (group name => UserGroupMembership object)
+ * @return UserGroupMembership[] Associative array of (group name => UserGroupMembership object)
*/
public static function getMembershipsForUser( $userId, IDatabase $db = null ) {
if ( !$db ) {