diff --git a/hash/test/namespace_fail_test.cpp b/hash/test/namespace_fail_test.cpp
index 2e02d57..d3c13aa 100644
--- a/hash/test/namespace_fail_test.cpp
+++ b/hash/test/namespace_fail_test.cpp
@@ -1,5 +1,13 @@
+
+// Copyright 2009 Daniel James.
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+
+// Check that I haven't inadvertantly pulled namespace std into the global
+// namespace.
+
 #include <list>
-#include <boost/functional/hash/detail/float_functions.hpp>
+#include <boost/functional/hash.hpp>
 
 typedef list<int> foo;