diff --git a/ctrl/attr.cfg b/ctrl/attr.cfg
index 7c716bdcd80048f359a4125c46f7931f8afc4ec2..293ef99cb1146443d93125eab328b7e31f31772d 100644
--- a/ctrl/attr.cfg
+++ b/ctrl/attr.cfg
@@ -15,3 +15,5 @@ GH					Chat Text Input Locally
 G					Chat Text Input Remotely
 W					Mult-node Chat Text Input
 WH					External Programs (default attribute)
+WH5					Backfill (percentage full/done)
+WH					Unfill (percentage empty/incomplete)