diff --git a/xep.ent b/xep.ent
index 82199946..4233b799 100644
--- a/xep.ent
+++ b/xep.ent
@@ -608,6 +608,7 @@ THE SOFTWARE.
RFC 6151 RFC 6151: Updated Security Considerations for the MD5 Message-Digest and the HMAC-MD5 Algorithms <http://tools.ietf.org/html/rfc6151>." >
RFC 6189 RFC 6189: ZRTP: Media Path Key Agreement for Unicast Secure RTP <http://tools.ietf.org/html/rfc6189>." >
RFC 6194 RFC 6194: Updated Security Considerations for the SHA-0 and SHA-1 Message-Digest Algorithms <http://tools.ietf.org/html/rfc6194>." >
+RFC 6234 RFC 6234: US Secure Hash Algorithms (SHA and SHA-based HMAC and HKDF) <http://tools.ietf.org/html/rfc6234>." >
RFC 6331 RFC 6331: Moving DIGEST-MD5 to Historic <http://tools.ietf.org/html/rfc6331>." >