From 069bcc72bf0dc0efd18490bce1dcdfd38f9a74e0 Mon Sep 17 00:00:00 2001
From: YAMAMOTO Takashi <yamamoto@valinux.co.jp>
Date: Wed, 22 Jan 2014 13:06:34 +0900
Subject: [PATCH] bgp: a comment

Signed-off-by: YAMAMOTO Takashi <yamamoto@valinux.co.jp>
Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
---
 ryu/lib/packet/bgp.py | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/ryu/lib/packet/bgp.py b/ryu/lib/packet/bgp.py
index 55696bd1..8643fa03 100644
--- a/ryu/lib/packet/bgp.py
+++ b/ryu/lib/packet/bgp.py
@@ -41,6 +41,9 @@ BGP_MSG_NOTIFICATION = 3
 BGP_MSG_KEEPALIVE = 4
 BGP_MSG_ROUTE_REFRESH = 5  # RFC 2918
 
+# NOTIFICATION Error Code and SubCode
+# Note: 0 is a valid SubCode.  (Unspecific)
+
 # NOTIFICATION Error Code  RFC 4271 4.5.
 BGP_ERROR_MESSAGE_HEADER_ERROR = 1
 BGP_ERROR_OPEN_MESSAGE_ERROR = 2