diff --git a/Shorewall/configfiles/tcinterfaces b/Shorewall/configfiles/tcinterfaces
index a1e1480d7..66e01f977 100644
--- a/Shorewall/configfiles/tcinterfaces
+++ b/Shorewall/configfiles/tcinterfaces
@@ -7,4 +7,4 @@
 # information.
 #
 ###############################################################################
-#INTERFACE	TYPE		IN-BANDWIDTH
+#INTERFACE	TYPE		IN-BANDWIDTH		OUT-BANDWIDTH
diff --git a/Shorewall6/configfiles/tcinterfaces b/Shorewall6/configfiles/tcinterfaces
index 5ec53e50f..2b96bad72 100644
--- a/Shorewall6/configfiles/tcinterfaces
+++ b/Shorewall6/configfiles/tcinterfaces
@@ -7,5 +7,5 @@
 # information.
 #
 ###############################################################################
-#INTERFACE		TYPE	IN-BANDWIDTH
+#INTERFACE		TYPE	IN-BANDWIDTH		OUT-INTERFACE