diff --git a/xep.ent b/xep.ent
index 3c6a5d26..41cb2b3f 100644
--- a/xep.ent
+++ b/xep.ent
@@ -632,6 +632,7 @@ THE SOFTWARE.
 
 <!ENTITY rfc6122bis "<span class='ref'><link url='https://datatracker.ietf.org/doc/draft-ietf-xmpp-6122bis/'>rfc6122bis</link></span> <note>Extensible Messaging and Presence Protocol (XMPP): Address Format &lt;<link url='https://datatracker.ietf.org/doc/draft-ietf-xmpp-6122bis/'>https://datatracker.ietf.org/doc/draft-ietf-xmpp-6122bis/</link>&gt;. Work in progress.</note>" >
 <!ENTITY atomsub "<span class='ref'><link url='http://xmpp.org/internet-drafts/draft-saintandre-atompub-notify-07.html'>AtomSub</link></span> <note>Atomsub: Transporting Atom Notifications over the Publish-Subscribe Extension to the Extensible Messaging and Presence Protocol (XMPP) &lt;<link url='http://xmpp.org/internet-drafts/draft-saintandre-atompub-notify-07.html'>http://xmpp.org/internet-drafts/draft-saintandre-atompub-notify-07.html</link>&gt;. Work in progress.</note>" >
+<!ENTITY cusax "<span class='ref'><link url='https://datatracker.ietf.org/doc/draft-ivov-xmpp-cusax/'>CUSAX</link></span> <note>CUSAX: Combined Use of the Session Initiation Protocol (SIP) and the Extensible Messaging and Presence Protocol (XMPP) &lt;<link url='https://datatracker.ietf.org/doc/draft-ivov-xmpp-cusax/'>https://datatracker.ietf.org/doc/draft-ivov-xmpp-cusax/</link>&gt;. Work in progress.</note>" >
 <!ENTITY dna-dns "<span class='ref'><link url='http://datatracker.ietf.org/doc/draft-miller-xmpp-dnssec-prooftype/'>draft-miller-xmpp-dnssec-prooftype</link></span> <note>Using DNS Security Extensions (DNSSEC) and DNS-based Authentication of Named Entities (DANE) as a Prooftype for XMPP Domain Name Associations &lt;<link url='http://datatracker.ietf.org/doc/draft-miller-xmpp-dnssec-prooftype/'>http://datatracker.ietf.org/doc/draft-miller-xmpp-dnssec-prooftype/</link>&gt;. Work in progress.</note>" >
 <!ENTITY dna-framework "<span class='ref'><link url='http://datatracker.ietf.org/doc/draft-saintandre-xmpp-dna/'>draft-saintandre-xmpp-dna</link></span> <note>Domain Name Associations (DNA) in the Extensible Messaging and Presence Protocol (XMPP) &lt;<link url='http://datatracker.ietf.org/doc/draft-saintandre-xmpp-dna/'>http://datatracker.ietf.org/doc/draft-saintandre-xmpp-dna/</link>&gt;. Work in progress.</note>" >
 <!ENTITY dtlssrtp "<span class='ref'><link url='http://tools.ietf.org/html/draft-ietf-avt-dtls-srtp'>DTLS-SRTP</link></span> <note>Datagram Transport Layer Security (DTLS) Extension to Establish Keys for Secure Real-time Transport Protocol (SRTP) &lt;<link url='http://tools.ietf.org/html/draft-ietf-avt-dtls-srtp'>http://tools.ietf.org/html/draft-ietf-avt-dtls-srtp</link>&gt;. Work in progress.</note>" >