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diff --git a/src/boost/libs/units/example/unit.cpp b/src/boost/libs/units/example/unit.cpp
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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)
+
+/** 
+\file
+    
+\brief unit.cpp
+
+\details
+Test unit algebra.
+
+Output:
+@verbatim
+
+//[unit_output
+L             = m
+L+L           = m
+L-L           = m
+L/L           = dimensionless 
+meter*meter   = m^2
+M*(L/T)*(L/T) = m^2 kg s^-2
+M*(L/T)^2     = m^2 kg s^-2
+L^3           = m^3
+L^(3/2)       = m^(3/2)
+2vM           = kg^(1/2)
+(3/2)vM       = kg^(2/3)
+//]
+
+@endverbatim
+**/
+
+#include <iostream>
+
+#include "test_system.hpp"
+
+#include <boost/units/pow.hpp>
+
+int main()
+{
+    using namespace boost::units;
+    using namespace boost::units::test;
+
+    //[unit_snippet_1
+    const length                    L;
+    const mass                      M;
+    // needs to be namespace-qualified because of global time definition
+    const boost::units::test::time  T;
+    const energy                    E;
+    //]
+    
+    std::cout << "L             = " << L << std::endl
+              << "L+L           = " << L+L << std::endl
+              << "L-L           = " << L-L << std::endl
+              << "L/L           = " << L/L << std::endl
+              << "meter*meter   = " << meter*meter << std::endl
+              << "M*(L/T)*(L/T) = " << M*(L/T)*(L/T) << std::endl
+              << "M*(L/T)^2     = " << M*pow<2>(L/T) << std::endl
+              << "L^3           = " << pow<3>(L) << std::endl
+              << "L^(3/2)       = " << pow<static_rational<3,2> >(L)
+              << std::endl
+              << "2vM           = " << root<2>(M) << std::endl
+              << "(3/2)vM       = " << root<static_rational<3,2> >(M)
+              << std::endl;
+
+    return 0;
+}