diff --git a/xep.ent b/xep.ent
index 05959902..1010c3ee 100644
--- a/xep.ent
+++ b/xep.ent
@@ -465,6 +465,7 @@
 <!ENTITY rfc4251 "<span class='ref'><link url='http://tools.ietf.org/html/rfc4251'>RFC 4251</link></span> <note>RFC 4251: The Secure Shell (SSH) Protocol Architecture &lt;<link url='http://tools.ietf.org/html/rfc4251'>http://tools.ietf.org/html/rfc4251</link>&gt;.</note>" >
 <!ENTITY rfc4252 "<span class='ref'><link url='http://tools.ietf.org/html/rfc4252'>RFC 4252</link></span> <note>RFC 4252: The Secure Shell (SHS) Authentication Protocol &lt;<link url='http://tools.ietf.org/html/rfc4252'>http://tools.ietf.org/html/rfc4252</link>&gt;.</note>" >
 <!ENTITY rfc4253 "<span class='ref'><link url='http://tools.ietf.org/html/rfc4253'>RFC 4253</link></span> <note>RFC 4253: The Secure Shell (SSH) Transport Layer Protocol &lt;<link url='http://tools.ietf.org/html/rfc4253'>http://tools.ietf.org/html/rfc4253</link>&gt;.</note>" >
+<!ENTITY rfc4270 "<span class='ref'><link url='http://tools.ietf.org/html/rfc4270'>RFC 4270</link></span> <note>RFC 4270: Attacks on Cryptographic Hashes in Internet Protocols &lt;<link url='http://tools.ietf.org/html/rfc4270'>http://tools.ietf.org/html/rfc4270</link>&gt;.</note>" >
 <!ENTITY rfc4287 "<span class='ref'><link url='http://tools.ietf.org/html/rfc4287'>RFC 4287</link></span> <note>RFC 4287: The Atom Syndication Format &lt;<link url='http://tools.ietf.org/html/rfc4287'>http://tools.ietf.org/html/rfc4287</link>&gt;.</note>" >
 <!ENTITY rfc4301 "<span class='ref'><link url='http://tools.ietf.org/html/rfc4301'>RFC 4301</link></span> <note>RFC 4301: Security Architecture for the Internet Protocol &lt;<link url='http://tools.ietf.org/html/rfc4301'>http://tools.ietf.org/html/rfc4301</link>&gt;.</note>" >
 <!ENTITY rfc4306 "<span class='ref'><link url='http://tools.ietf.org/html/rfc4306'>RFC 4306</link></span> <note>RFC 4306: Internet Key Exchange (IKEv2) Protocol &lt;<link url='http://tools.ietf.org/html/rfc4306'>http://tools.ietf.org/html/rfc4306</link>&gt;.</note>" >