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diff --git a/boost/units/is_unit.hpp b/boost/units/is_unit.hpp
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+++ b/boost/units/is_unit.hpp
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+// Boost.Units - A C++ library for zero-overhead dimensional analysis and 
+// unit/quantity manipulation and conversion
+//
+// Copyright (C) 2003-2008 Matthias Christian Schabel
+// Copyright (C) 2008 Steven Watanabe
+//
+// 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)
+
+#ifndef BOOST_UNITS_IS_UNIT_HPP
+#define BOOST_UNITS_IS_UNIT_HPP
+
+///
+/// \file
+/// \brief Check that a type is a unit.
+///
+
+#include <boost/mpl/bool.hpp>
+#include <boost/units/units_fwd.hpp>
+
+namespace boost {
+
+namespace units {
+
+/// Check that a type is a unit.
+template<class T>
+struct is_unit : 
+    public mpl::false_
+{ };
+
+template<class Dim,class System>
+struct is_unit< unit<Dim,System> > :
+    public mpl::true_
+{ };
+
+} // namespace units
+
+} // namespace boost
+
+#endif // BOOST_UNITS_IS_UNIT_HPP