tc/m_vlan.c: mention CONTROL option in help text

Signed-off-by: Phil Sutter <phil@nwl.cc>
Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>

tc/m_vlan.c

@@ -22,9 +22,10 @@
 static void explain(void)
 {
 	fprintf(stderr, "Usage: vlan pop\n");
-	fprintf(stderr, "       vlan push [ protocol VLANPROTO ] id VLANID\n");
+	fprintf(stderr, "       vlan push [ protocol VLANPROTO ] id VLANID [CONTROL]\n");
 	fprintf(stderr, "       VLANPROTO is one of 802.1Q or 802.1AD\n");
 	fprintf(stderr, "            with default: 802.1Q\n");
+	fprintf(stderr, "       CONTROL := reclassify | pipe | drop | continue | pass\n");
 }
 
 static void usage(void)