diff --git a/boost/mpl/limits/arity.hpp b/boost/mpl/limits/arity.hpp
new file mode 100644
index 0000000..9da70ab
--- /dev/null
+++ b/boost/mpl/limits/arity.hpp
@@ -0,0 +1,21 @@
+
+#ifndef BOOST_MPL_LIMITS_ARITY_HPP_INCLUDED
+#define BOOST_MPL_LIMITS_ARITY_HPP_INCLUDED
+
+// Copyright Aleksey Gurtovoy 2000-2004
+//
+// 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)
+//
+// See http://www.boost.org/libs/mpl for documentation.
+
+// $Id: arity.hpp 49267 2008-10-11 06:19:02Z agurtovoy $
+// $Date: 2008-10-10 23:19:02 -0700 (Fri, 10 Oct 2008) $
+// $Revision: 49267 $
+
+#if !defined(BOOST_MPL_LIMIT_METAFUNCTION_ARITY)
+#   define BOOST_MPL_LIMIT_METAFUNCTION_ARITY 5
+#endif
+
+#endif // BOOST_MPL_LIMITS_ARITY_HPP_INCLUDED