diff --git a/xep.ent b/xep.ent
index 103a41be..3d016bb6 100644
--- a/xep.ent
+++ b/xep.ent
@@ -373,6 +373,7 @@
 <!ENTITY rfc2518 "<span class='ref'><link url='http://tools.ietf.org/html/rfc2518'>RFC 2518</link></span> <note>RFC 2518: HTTP Extensions for Distributed Authoring -- WEBDAV &lt;<link url='http://tools.ietf.org/html/rfc2518'>http://tools.ietf.org/html/rfc2518</link>&gt;.</note>" >
 <!ENTITY rfc2518bis "<span class='ref'><link url='http://tools.ietf.org/html/draft-ietf-webdav-rfc2518bis'>rfc2518bis</link></span> <note>RFC 2518: HTTP Extensions for Distributed Authoring -- WebDAV &lt;<link url='http://tools.ietf.org/html/draft-ietf-webdav-rfc2518bis'>http://tools.ietf.org/html/draft-ietf-webdav-rfc2518bis</link>&gt;.</note>" >
 <!ENTITY rfc2606 "<span class='ref'><link url='http://tools.ietf.org/html/rfc2606'>RFC 2606</link></span> <note>RFC 2606: Reserved Top Level DNS Names &lt;<link url='http://tools.ietf.org/html/rfc2606'>http://tools.ietf.org/html/rfc2606</link>&gt;.</note>" >
+<!ENTITY rfc2608 "<span class='ref'><link url='http://tools.ietf.org/html/rfc2608'>RFC 2608</link></span> <note>RFC 2608: Service Location Protocol, Version 2 &lt;<link url='http://tools.ietf.org/html/rfc2608'>http://tools.ietf.org/html/rfc2608</link>&gt;.</note>" >
 <!ENTITY rfc2616 "<span class='ref'><link url='http://tools.ietf.org/html/rfc2616'>RFC 2616</link></span> <note>RFC 2616: Hypertext Transport Protocol -- HTTP/1.1 &lt;<link url='http://tools.ietf.org/html/rfc2616'>http://tools.ietf.org/html/rfc2616</link>&gt;.</note>" >
 <!ENTITY rfc2617 "<span class='ref'><link url='http://tools.ietf.org/html/rfc2617'>RFC 2617</link></span> <note>RFC 2617: HTTP Authentication: Basic and Digest Access Authentication &lt;<link url='http://tools.ietf.org/html/rfc2617'>http://tools.ietf.org/html/rfc2617</link>&gt;.</note>" >
 <!ENTITY rfc2631 "<span class='ref'><link url='http://tools.ietf.org/html/rfc2631'>RFC 2631</link></span> <note>RFC 2631: Diffie-Hellman Key Agreement Method &lt;<link url='http://tools.ietf.org/html/rfc2631'>http://tools.ietf.org/html/rfc2631</link>&gt;.</note>" >