diff --git a/xep.ent b/xep.ent
index 9c4e82ea..f6de2fd0 100644
--- a/xep.ent
+++ b/xep.ent
@@ -530,6 +530,7 @@ THE SOFTWARE.
 <!ENTITY rfc4033 "<span class='ref'><link url='http://tools.ietf.org/html/rfc4033'>RFC 4033</link></span> <note>RFC 4033: DNS Security Introduction and Requirements &lt;<link url='http://tools.ietf.org/html/rfc4033'>http://tools.ietf.org/html/rfc4033</link>&gt;.</note>" >
 <!ENTITY rfc4086 "<span class='ref'><link url='http://tools.ietf.org/html/rfc4086'>RFC 4086</link></span> <note>RFC 4086: Randomness Requirements for Security &lt;<link url='http://tools.ietf.org/html/rfc4086'>http://tools.ietf.org/html/rfc4086</link>&gt;.</note>" >
 <!ENTITY rfc4119 "<span class='ref'><link url='http://tools.ietf.org/html/rfc4119'>RFC 4119</link></span> <note>RFC 4119: A Presence-based GEOPRIV Location Object Format &lt;<link url='http://tools.ietf.org/html/rfc4119'>http://tools.ietf.org/html/rfc4119</link>&gt;.</note>" >
+<!ENTITY rfc4120 "<span class='ref'><link url='http://tools.ietf.org/html/rfc4120'>RFC 4120</link></span> <note>RFC 4120: The Kerberos Network Authentication Service (V5) &lt;<link url='http://tools.ietf.org/html/rfc4120'>http://tools.ietf.org/html/rfc4120</link>&gt;.</note>" >
 <!ENTITY rfc4122 "<span class='ref'><link url='http://tools.ietf.org/html/rfc4122'>RFC 4122</link></span> <note>RFC 4122: A Universally Unique IDentifier (UUID) URN Namespace &lt;<link url='http://tools.ietf.org/html/rfc4122'>http://tools.ietf.org/html/rfc4122</link>&gt;.</note>" >
 <!ENTITY rfc4227 "<span class='ref'><link url='http://tools.ietf.org/html/rfc4227'>RFC 4227</link></span> <note>RFC 4227: Using the Simple Object Access Protocol (SOAP) in Blocks Extensible Exchange Protocol (BEEP) &lt;<link url='http://tools.ietf.org/html/rfc4227'>http://tools.ietf.org/html/rfc4227</link>&gt;.</note>" >
 <!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>" >