diff --git a/include/acl_selectors.php b/include/acl_selectors.php
index fccdb80665..f4b644d68f 100644
--- a/include/acl_selectors.php
+++ b/include/acl_selectors.php
@@ -495,6 +495,8 @@ function acl_lookup(App $a, $out_type = 'json') {
 
 	if ($type=='' || $type=='g'){
 
+		/// @todo We should cache this query.
+		// This can be done when we can delete cache entries via wildcard
 		$r = q("SELECT `group`.`id`, `group`.`name`, GROUP_CONCAT(DISTINCT `group_member`.`contact-id` SEPARATOR ',') AS uids
 				FROM `group`
 				INNER JOIN `group_member` ON `group_member`.`gid`=`group`.`id` AND `group_member`.`uid` = `group`.`uid`