diff --git a/articles/ui/ui.tex b/articles/ui/ui.tex
index 0f8872abf..442e059da 100644
--- a/articles/ui/ui.tex
+++ b/articles/ui/ui.tex
@@ -1435,7 +1435,10 @@ simultaneously using a modern payment protocol.
 
 This work benefits from the financial support of the Brittany Region
 (ARED 9178) and a grant from the Renewable Freedom Foundation.  We
-thank Neal Walfield for comments on an earlier draft of the paper.
+thank Bruno Haible for his financial support enabling us to
+participate with the W3c payment working group.  We thank the W3c
+payment working group for insightful discussions about Web payments.
+We thank Neal Walfield for comments on an earlier draft of the paper.
 
 \bibliographystyle{splncs03}
 \bibliography{ui,btc,taler,rfc}