diff --git a/phpBB/includes/functions_user.php b/phpBB/includes/functions_user.php
index bb52d36471..6468e2f11b 100644
--- a/phpBB/includes/functions_user.php
+++ b/phpBB/includes/functions_user.php
@@ -1307,7 +1307,7 @@ function group_delete($group_id, $group_name = false)
 
 	add_log('admin', 'LOG_GROUP_DELETE', $group_name);
 
-	return false;
+	return 'GROUP_DELETED';
 }
 
 /**
@@ -1322,7 +1322,7 @@ function group_user_add($group_id, $user_id_ary = false, $username_ary = false,
 
 	if (!sizeof($user_id_ary))
 	{
-		return false;
+		return 'NO_USER';
 	}
 
 	// Remove users who are already members of this group
@@ -1420,7 +1420,7 @@ function group_user_add($group_id, $user_id_ary = false, $username_ary = false,
 
 	add_log('admin', $log, $group_name, implode(', ', $username_ary));
 
-	return true;
+	return ($leader) ? 'GROUP_LEADERS_ADDED' : 'GROUP_USERS_ADDED';
 }
 
 /**
@@ -1439,7 +1439,7 @@ function group_user_del($group_id, $user_id_ary = false, $username_ary = false,
 
 	if (!sizeof($user_id_ary))
 	{
-		return false;
+		return 'NO_USER';
 	}
 
 	$sql = 'SELECT *
@@ -1538,7 +1538,7 @@ function group_user_del($group_id, $user_id_ary = false, $username_ary = false,
 
 	add_log('admin', $log, $group_name, implode(', ', $username_ary));
 
-	return true;
+	return 'GROUP_USERS_REMOVE';
 }
 
 /**
diff --git a/phpBB/language/en/acp/groups.php b/phpBB/language/en/acp/groups.php
index 15a6aea284..25a9366f3c 100644
--- a/phpBB/language/en/acp/groups.php
+++ b/phpBB/language/en/acp/groups.php
@@ -64,6 +64,7 @@ $lang = array_merge($lang, array(
 	'GROUP_HIDDEN'					=> 'Hidden',
 	'GROUP_LANG'					=> 'Group language',
 	'GROUP_LEAD'					=> 'Group leaders',
+	'GROUP_LEADERS_ADDED'			=> 'New leaders added to group successfully.',
 	'GROUP_LEGEND'					=> 'Display group in legend',
 	'GROUP_LIST'					=> 'Current members',
 	'GROUP_LIST_EXPLAIN'			=> 'This is a complete list of all the current users with membership of this group. You can delete members (except in certain special groups) or add new ones as you see fit.',