diff --git a/ryu/lib/packet/bgp.py b/ryu/lib/packet/bgp.py
index 7e9bb4d3..55696bd1 100644
--- a/ryu/lib/packet/bgp.py
+++ b/ryu/lib/packet/bgp.py
@@ -21,7 +21,6 @@ RFC 4271 BGP-4
 # todo
 # - notify data
 # - RFC 4364 BGP/MPLS IP Virtual Private Networks (VPNs)
-# - RFC 4486 Subcodes for BGP Cease Notification Message
 
 import abc
 import struct
@@ -76,6 +75,16 @@ BGP_ERROR_SUB_OPTIONAL_ATTRIBUTE_ERROR = 9
 BGP_ERROR_SUB_INVALID_NETWORK_FIELD = 10
 BGP_ERROR_SUB_MALFORMED_AS_PATH = 11
 
+# NOTIFICATION Error Subcode for BGP_ERROR_CEASE  (RFC 4486)
+BGP_ERROR_SUB_MAXIMUM_NUMBER_OF_PREFIXES_REACHED = 1
+BGP_ERROR_SUB_ADMINISTRATIVE_SHUTDOWN = 2
+BGP_ERROR_SUB_PEER_DECONFIGURED = 3
+BGP_ERROR_SUB_ADMINISTRATIVE_RESET = 4
+BGP_ERROR_SUB_CONNECTION_RESET = 5
+BGP_ERROR_SUB_OTHER_CONFIGURATION_CHANGE = 6
+BGP_ERROR_SUB_CONNECTION_COLLISION_RESOLUTION = 7
+BGP_ERROR_SUB_OUT_OF_RESOURCES = 8
+
 _VERSION = 4
 _MARKER = 16 * '\xff'