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diff --git a/boost/log/expressions/message.hpp b/boost/log/expressions/message.hpp
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+/*
+ *          Copyright Andrey Semashev 2007 - 2014.
+ * 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   message.hpp
+ * \author Andrey Semashev
+ * \date   13.07.2012
+ *
+ * The header contains log message keyword declaration.
+ */
+
+#ifndef BOOST_LOG_EXPRESSIONS_MESSAGE_HPP_INCLUDED_
+#define BOOST_LOG_EXPRESSIONS_MESSAGE_HPP_INCLUDED_
+
+#include <string>
+#include <boost/mpl/vector.hpp>
+#include <boost/log/detail/config.hpp>
+#include <boost/log/detail/default_attribute_names.hpp>
+#include <boost/log/expressions/keyword.hpp>
+#include <boost/log/expressions/is_keyword_descriptor.hpp>
+#include <boost/log/attributes/attribute_name.hpp>
+#include <boost/log/detail/header.hpp>
+
+#ifdef BOOST_HAS_PRAGMA_ONCE
+#pragma once
+#endif
+
+namespace boost {
+
+BOOST_LOG_OPEN_NAMESPACE
+
+namespace expressions {
+
+namespace tag {
+
+/*!
+ * Generic log message attribute descriptor.
+ */
+struct message :
+    public keyword_descriptor
+{
+    // The attribute value type here is not essential since message attributes are not intended to be created via the keyword
+    typedef void attribute_type;
+
+#if defined(BOOST_LOG_USE_CHAR) && defined(BOOST_LOG_USE_WCHAR_T)
+    typedef mpl::vector2< std::string, std::wstring > value_type;
+#elif defined(BOOST_LOG_USE_CHAR)
+    typedef std::string value_type;
+#elif defined(BOOST_LOG_USE_WCHAR_T)
+    typedef std::wstring value_type;
+#endif
+
+    static attribute_name get_name() { return boost::log::aux::default_attribute_names::message(); }
+};
+
+#if defined(BOOST_LOG_USE_CHAR)
+/*!
+ * Narrow character log message attribute descriptor.
+ */
+struct smessage :
+    public keyword_descriptor
+{
+    // The attribute value type here is not essential since message attributes are not intended to be created via the keyword
+    typedef void attribute_type;
+    typedef std::string value_type;
+
+    static attribute_name get_name() { return boost::log::aux::default_attribute_names::message(); }
+};
+#endif
+
+#if defined(BOOST_LOG_USE_WCHAR_T)
+/*!
+ * Wide character log message attribute descriptor.
+ */
+struct wmessage :
+    public keyword_descriptor
+{
+    // The attribute value type here is not essential since message attributes are not intended to be created via the keyword
+    typedef void attribute_type;
+    typedef std::wstring value_type;
+
+    static attribute_name get_name() { return boost::log::aux::default_attribute_names::message(); }
+};
+#endif
+
+} // namespace tag
+
+/*!
+ * Generic message keyword type.
+ */
+typedef attribute_keyword< tag::message > message_type;
+/*!
+ * Generic message keyword.
+ */
+const message_type message = {};
+
+#if defined(BOOST_LOG_USE_CHAR)
+/*!
+ * Narrow message keyword type.
+ */
+typedef attribute_keyword< tag::smessage > smessage_type;
+/*!
+ * Narrow message keyword.
+ */
+const smessage_type smessage = {};
+#endif
+
+#if defined(BOOST_LOG_USE_WCHAR_T)
+/*!
+ * Wide message keyword type.
+ */
+typedef attribute_keyword< tag::wmessage > wmessage_type;
+/*!
+ * Wide message keyword.
+ */
+const wmessage_type wmessage = {};
+#endif
+
+} // namespace expressions
+
+BOOST_LOG_CLOSE_NAMESPACE // namespace log
+
+} // namespace boost
+
+#include <boost/log/detail/footer.hpp>
+
+#endif // BOOST_LOG_EXPRESSIONS_MESSAGE_HPP_INCLUDED_