diff --git a/plugins/network/upnpc_ b/plugins/network/upnpc_
index 171fb532..36ce6fbd 100755
--- a/plugins/network/upnpc_
+++ b/plugins/network/upnpc_
@@ -134,6 +134,7 @@ EOF
 graph_title Uplink traffic${HOST_TITLE}
 graph_args --base 1000 -l 0
 graph_category network
+graph_vlabel bits per second in (-) / out (+)
 EOF
 			if [ "${traffic_remove_max:-false}" != 'true' ]; then
 				cat << EOF