diff --git a/xep.ent b/xep.ent
index d0f34040..b6f2fab4 100644
--- a/xep.ent
+++ b/xep.ent
@@ -567,6 +567,7 @@ THE SOFTWARE.
 <!ENTITY rfc4732 "<span class='ref'><link url='http://tools.ietf.org/html/rfc4732'>RFC 4732</link></span> <note>RFC 4732: Internet Denial-of-Service Considerations &lt;<link url='http://tools.ietf.org/html/rfc4732'>http://tools.ietf.org/html/rfc4732</link>&gt;.</note>" >
 <!ENTITY rfc4733 "<span class='ref'><link url='http://tools.ietf.org/html/rfc4733'>RFC 4733</link></span> <note>RFC 4733: RTP Payload for DTMF Digits, Telephony Tones, and Telephony Signals &lt;<link url='http://tools.ietf.org/html/rfc4733'>http://tools.ietf.org/html/rfc4733</link>&gt;.</note>" >
 <!ENTITY rfc4752 "<span class='ref'><link url='http://tools.ietf.org/html/rfc4752'>RFC 4752</link></span> <note>RFC 4752: The Kerberos V5 (&quot;GSSAPI&quot;) Simple Authentication and Security Layer (SASL) Mechanism  &lt;<link url='http://tools.ietf.org/html/rfc4752'>http://tools.ietf.org/html/rfc4752</link>&gt;.</note>" >
+<!ENTITY rfc4770 "<span class='ref'><link url='http://tools.ietf.org/html/rfc4770'>RFC 4770</link></span> <note>RFC 4770: vCard Extensions for Instant Messaging (IM) &lt;<link url='http://tools.ietf.org/html/rfc4770'>http://tools.ietf.org/html/rfc4770</link>&gt;.</note>" >
 <!ENTITY rfc4790 "<span class='ref'><link url='http://tools.ietf.org/html/rfc4790'>RFC 4790</link></span> <note>RFC 4790: Internet Application Protocol Collation Registry &lt;<link url='http://tools.ietf.org/html/rfc4790'>http://tools.ietf.org/html/rfc4790</link>&gt;.</note>" >
 <!ENTITY rfc4848 "<span class='ref'><link url='http://tools.ietf.org/html/rfc4848'>RFC 4848</link></span> <note>RFC 4848: Domain-Based Application Service Location Using URIs and the Dynamic Delegation Discovery Service (DDDS) &lt;<link url='http://tools.ietf.org/html/rfc4848'>http://tools.ietf.org/html/rfc4848</link>&gt;.</note>" >
 <!ENTITY rfc4854 "<span class='ref'><link url='http://tools.ietf.org/html/rfc4854'>RFC 4854</link></span> <note>RFC 4854: A Uniform Resource Name (URN) Namespace for Extensions to the Extensible Messaging and Presence Protocol (XMPP) &lt;<link url='http://tools.ietf.org/html/rfc4854'>http://tools.ietf.org/html/rfc4854</link>&gt;.</note>" >