diff --git a/xep.ent b/xep.ent
index 3f08d469..c35b4509 100644
--- a/xep.ent
+++ b/xep.ent
@@ -586,6 +586,7 @@ THE SOFTWARE.
 <!ENTITY kittenspnkrb5 "<span class='ref'><link url='http://tools.ietf.org/html/draft-ietf-kitten-krb5-gssapi-domain-based-names'>draft-ietf-kitten-krb5-gssapi-domain-based-names</link></span> <note>GSS-API Domain-Based Service Names Mapping for the Kerberos V GSS Mechanism &lt;<link url='http://tools.ietf.org/html/draft-ietf-kitten-krb5-gssapi-domain-based-names'>http://tools.ietf.org/html/draft-ietf-kitten-krb5-gssapi-domain-based-names</link>&gt;. Work in progress.</note>" >
 <!ENTITY mdns "<span class='ref'><link url='http://tools.ietf.org/html/draft-cheshire-dnsext-multicastdns'>Multicast DNS</link></span> <note>Multicast DNS &lt;<link url='http://tools.ietf.org/html/draft-cheshire-dnsext-multicastdns'>http://tools.ietf.org/html/draft-cheshire-dnsext-multicastdns</link>&gt;. Work in progress.</note>" >
 <!ENTITY pidf "<span class='ref'><link url='http://tools.ietf.org/html/rfc3863'>Presence Information Data Format (PIDF) </link></span> <note>RFC 3863: Presence Information Data Format (PIDF) &lt;<link url='http://tools.ietf.org/html/rfc3863'>http://tools.ietf.org/html/rfc3863</link>&gt;.</note>" >
+<!ENTITY rtpkeepalive "<span class='ref'><link url='http://tools.ietf.org/html/draft-ietf-avt-app-rtp-keepalive'>Application Mechanism for maintaining alive the Network Address Translator (NAT) mappings associated to RTP flows</link></span> <note>Application Mechanism for maintaining alive the Network Address Translator (NAT) mappings associated to RTP flows &lt;<link url='http://tools.ietf.org/html/draft-ietf-avt-app-rtp-keepalive'>http://tools.ietf.org/html/draft-ietf-avt-app-rtp-keepalive</link>&gt;. Work in progress.</note>" >
 <!ENTITY rtpspeex "<span class='ref'><link url='http://tools.ietf.org/html/draft-ietf-avt-rtp-speex'>RTP Payload Format for the Speex Codec</link></span> <note>RTP Payload Format for the Speex Codec &lt;<link url='http://tools.ietf.org/html/draft-ietf-avt-rtp-speex'>http://tools.ietf.org/html/draft-ietf-avt-rtp-speex</link>&gt;. Work in progress.</note>" >
 <!ENTITY rtptheora "<span class='ref'><link url='http://tools.ietf.org/html/draft-barbato-avt-rtp-theora'>RTP Payload Format for Theora Encoded Video</link></span> <note>RTP Payload Format for Theora Encoded Video &lt;<link url='http://tools.ietf.org/html/draft-barbato-avt-rtp-theora'>http://tools.ietf.org/html/draft-barbato-avt-rtp-theora</link>&gt;. Work in progress.</note>" >
 <!ENTITY saslkrb5 "<span class='ref'><link url='http://tools.ietf.org/html/draft-ietf-sasl-gssapi'>draft-ietf-sasl-gssapi</link></span> <note>The Kerberos V5 (GSSAPI) SASL mechanism &lt;<link url='http://tools.ietf.org/html/draft-ietf-sasl-gssapi'>http://tools.ietf.org/html/draft-ietf-sasl-gssapi</link>&gt;. Work in progress.</note>" >