diff --git a/bip-0072.mediawiki b/bip-0072.mediawiki
index dae53f46..e4ed52f3 100644
--- a/bip-0072.mediawiki
+++ b/bip-0072.mediawiki
@@ -38,7 +38,9 @@ described in BIP 70.
 
 Bitcoin wallets must support fetching PaymentRequests via http and
 https protocols; they may support other protocols. Wallets must
-include an Accept HTTP header in HTTP(s) requests:
+include an "Accept" HTTP header in HTTP(s) requests (as defined
+in RFC 2616):
+
 <pre>Accept: application/bitcoin-paymentrequest</pre>
 
 If a PaymentRequest cannot be obtained (perhaps the server is
@@ -59,3 +61,7 @@ Non-backwards-compatible equivalent:
 <pre>
 bitcoin:?r=https://merchant.com/pay.php?h%3D2a8628fc2fbe
 </pre>
+
+==References==
+
+[[http://www.w3.org/Protocols/rfc2616/rfc2616.html|RFC 2616]] : Hypertext Transfer Protocol -- HTTP/1.1 
\ No newline at end of file