diff --git a/tc/q_cbq.c b/tc/q_cbq.c
index c891ac5c..e53d1673 100644
--- a/tc/q_cbq.c
+++ b/tc/q_cbq.c
@@ -32,6 +32,7 @@ static void explain_class(void)
 	fprintf(stderr, "               [ prio NUMBER ] [ cell BYTES ] [ ewma LOG ]\n");
 	fprintf(stderr, "               [ estimator INTERVAL TIME_CONSTANT ]\n");
 	fprintf(stderr, "               [ split CLASSID ] [ defmap MASK/CHANGE ]\n");
+	fprintf(stderr, "               [ overhead BYTES ]\n");
 }
 
 static void explain(void)