diff --git a/ggsn/cmdline.ggo b/ggsn/cmdline.ggo
index 9c4c976..47ff102 100644
--- a/ggsn/cmdline.ggo
+++ b/ggsn/cmdline.ggo
@@ -33,3 +33,6 @@
 option  "qos"         q "Requested quality of service"  int    default="0x0b921f" no
 option  "logfile"     - "Logfile for errors"            string no
 option  "loglevel"    - "Global log ldevel"		string default="error" no
+
+option  "gtpnl"       g "GTP kernel support"            string default="eth0" no
+