diff --git a/bip-0047.mediawiki b/bip-0047.mediawiki
index af801f96..ada9deb5 100644
--- a/bip-0047.mediawiki
+++ b/bip-0047.mediawiki
@@ -1,7 +1,7 @@
 RECENT CHANGES:
+* (28 Sep 2017) Adjust text to match test vectors
 * (19 Apr 2016) Define version 2 payment codes
 * (17 Apr 2016) Clarify usage of outpoints in notification transactions
-* (18 Dec 2015) Update explanations to resolve FAQs
 
 <pre>
   BIP: 47
@@ -158,7 +158,7 @@ Note: this procedure is used if Bob uses a version 1 payment code (regardless of
 ## Alice selects the private key corresponding to the designated pubkey: <pre>a</pre>
 ## Alice selects the public key associated with Bob's notification address: <pre>B, where B = bG</pre>
 ## Alice calculates a secret point: <pre>S = aB</pre>
-## Alice calculates a 64 byte blinding factor: <pre>s = HMAC-SHA512(x, o)</pre>
+## Alice calculates a 64 byte blinding factor: <pre>s = HMAC-SHA512(o, x)</pre>
 ### "x" is the x value of the secret point
 ### "o" is the outpoint being spent by the designated input
 # Alice serializes her payment code in binary form.