diff --git a/include/boost/unordered_map.hpp b/include/boost/unordered_map.hpp
index 6fface3f..a0359c28 100644
--- a/include/boost/unordered_map.hpp
+++ b/include/boost/unordered_map.hpp
@@ -4,6 +4,8 @@
 // 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/unordered for documentation
+
 #ifndef BOOST_UNORDERED_MAP_HPP_INCLUDED
 #define BOOST_UNORDERED_MAP_HPP_INCLUDED
 
diff --git a/include/boost/unordered_set.hpp b/include/boost/unordered_set.hpp
index 056a9e22..c419bdc4 100644
--- a/include/boost/unordered_set.hpp
+++ b/include/boost/unordered_set.hpp
@@ -4,6 +4,8 @@
 // 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/unordered for documentation
+
 #ifndef BOOST_UNORDERED_SET_HPP_INCLUDED
 #define BOOST_UNORDERED_SET_HPP_INCLUDED