Index: trunk/CONTRIBUTION
===================================================================
--- trunk/CONTRIBUTION	(revision 6043)
+++ trunk/CONTRIBUTION	(revision 6370)
@@ -43,2 +43,6 @@
 The signpost code (http://code.google.com/p/oauth-signpost/)
 is from Matthias Käppler and licensed with the Apache License 2.0.
+
+The opening hour validation uses code from opening_hour.js
+(https://github.com/ypid/opening_hours.js) which is licensed
+with the New (2-clause) BSD license.