diff --git a/etc/flags b/etc/flags
index bda76eb..0cd3e49 100644
--- a/etc/flags
+++ b/etc/flags
@@ -51,6 +51,7 @@ SQUIRRELMAIL	Package is SquirrelMail addon/plugin
 LUA		Package needs lua's generic configuration
 X11R6		Package has hardcoded references to X11R6
 GNU99		Package needs -std=gnu99 hardcoded
+GNU-11		Package needs -std=gnu++11 hardcoded
 
 CLAWS		Package is a Claws-mail plugin