diff --git a/bip-0121.mediawiki b/bip-0121.mediawiki
index 38677e63..bafe8564 100644
--- a/bip-0121.mediawiki
+++ b/bip-0121.mediawiki
@@ -104,9 +104,9 @@ not make their <tt>p</tt> parameter unnecessarily long.
 
 Wallet implementations must support the <tt>http:</tt> and
 <tt>https:</tt> schemes in which case <tt>POST</tt> method must be
-used. The content type of the POST request must be set to
-
- application/bitcoin-pop
+used. The PoP is sent as a binary serialized transaction. The content
+type of the POST request must be set to
+<tt>application/bitcoin-pop</tt>
 
 == Examples ==