diff --git a/xep.ent b/xep.ent
index 9d145ade..a41c5115 100644
--- a/xep.ent
+++ b/xep.ent
@@ -579,6 +579,7 @@ THE SOFTWARE.
 <!ENTITY rfc5359 "<span class='ref'><link url='http://tools.ietf.org/html/rfc5359'>RFC 5359</link></span> <note>RFC 5359: Session Initiation Protocol Service Examples &lt;<link url='http://tools.ietf.org/html/rfc5359'>http://tools.ietf.org/html/rfc5359</link>&gt;.</note>" >
 <!ENTITY rfc5389 "<span class='ref'><link url='http://tools.ietf.org/html/rfc5389'>RFC 5389</link></span> <note>RFC 5389: Session Traversal Utilities for NAT (STUN) &lt;<link url='http://tools.ietf.org/html/rfc5389'>http://tools.ietf.org/html/rfc5389</link>&gt;.</note>" >
 <!ENTITY rfc5391 "<span class='ref'><link url='http://tools.ietf.org/html/rfc5391'>RFC 5391</link></span> <note>RFC 5391: RTP Payload Format for ITU-T Recommendation G.711.1 &lt;<link url='http://tools.ietf.org/html/rfc5391'>http://tools.ietf.org/html/rfc5391</link>&gt;.</note>" >
+<!ENTITY rfc5547 "<span class='ref'><link url='http://tools.ietf.org/html/rfc5547'>RFC 5547</link></span> <note>A Session Description Protocol (SDP) Offer/Answer Mechanism to Enable File Transfer &lt;<link url='http://tools.ietf.org/html/rfc5547'>http://tools.ietf.org/html/rfc5547</link>&gt;.</note>" >
 <!ENTITY rfc5574 "<span class='ref'><link url='http://tools.ietf.org/html/rfc5574'>RFC 5574</link></span> <note>RTP Payload Format for the Speex Codec &lt;<link url='http://tools.ietf.org/html/rfc5574'>http://tools.ietf.org/html/rfc5574</link>&gt;.</note>" >
 
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