diff --git a/include/boost/utility/compare_pointees.hpp b/include/boost/utility/compare_pointees.hpp
index e6888a6..7e2515c 100644
--- a/include/boost/utility/compare_pointees.hpp
+++ b/include/boost/utility/compare_pointees.hpp
@@ -4,7 +4,7 @@
 // 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/lib/optional for documentation.
+// See http://www.boost.org/libs/optional for documentation.
 //
 // You are welcome to contact the author at:
 //  fernando_cacciola@hotmail.com
diff --git a/include/boost/utility/detail/in_place_factory_prefix.hpp b/include/boost/utility/detail/in_place_factory_prefix.hpp
index 6ce7247..afd76b5 100644
--- a/include/boost/utility/detail/in_place_factory_prefix.hpp
+++ b/include/boost/utility/detail/in_place_factory_prefix.hpp
@@ -5,7 +5,7 @@
 // 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/lib/optional for documentation.
+// See http://www.boost.org/libs/optional for documentation.
 //
 // You are welcome to contact the author at:
 //  fernando_cacciola@hotmail.com
diff --git a/include/boost/utility/detail/in_place_factory_suffix.hpp b/include/boost/utility/detail/in_place_factory_suffix.hpp
index b1fc4d3..58f48c7 100644
--- a/include/boost/utility/detail/in_place_factory_suffix.hpp
+++ b/include/boost/utility/detail/in_place_factory_suffix.hpp
@@ -5,7 +5,7 @@
 // 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/lib/optional for documentation.
+// See http://www.boost.org/libs/optional for documentation.
 //
 // You are welcome to contact the author at:
 //  fernando_cacciola@hotmail.com
diff --git a/include/boost/utility/in_place_factory.hpp b/include/boost/utility/in_place_factory.hpp
index 16eaacf..f84b003 100644
--- a/include/boost/utility/in_place_factory.hpp
+++ b/include/boost/utility/in_place_factory.hpp
@@ -5,7 +5,7 @@
 // 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/lib/optional for documentation.
+// See http://www.boost.org/libs/optional for documentation.
 //
 // You are welcome to contact the author at:
 //  fernando_cacciola@hotmail.com
diff --git a/include/boost/utility/typed_in_place_factory.hpp b/include/boost/utility/typed_in_place_factory.hpp
index 347b7f4..833a346 100644
--- a/include/boost/utility/typed_in_place_factory.hpp
+++ b/include/boost/utility/typed_in_place_factory.hpp
@@ -5,7 +5,7 @@
 // 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/lib/optional for documentation.
+// See http://www.boost.org/libs/optional for documentation.
 //
 // You are welcome to contact the author at:
 //  fernando_cacciola@hotmail.com