Add RFC 2136 to RFC reference [#1201]

diff --git a/doc/rfc.rst b/doc/rfc.rst
index 89dd0aa6fc66a976c807c33163415ea7ce214227..3995776ad54345e51d8477c2c17ea17562f5dc16 100644 (file)
--- a/doc/rfc.rst
+++ b/doc/rfc.rst
@@ -35,6 +35,9 @@ Core RFCs
 `RFC 1996 <https://tools.ietf.org/html/rfc1996>`_
     The NOTIFY protocol.
 
+`RFC 2136 <https://tools.ietf.org/html/rfc2136>`_
+    Dynamic Updates in the Domain Name System (DNS UPDATE)
+
 `RFC 2181 <https://tools.ietf.org/html/rfc2181>`_
     Clarifications to the specification.