diff --git a/include/boost/optional/optional_fwd.hpp b/include/boost/optional/optional_fwd.hpp
index f36bebf..a74fe10 100644
--- a/include/boost/optional/optional_fwd.hpp
+++ b/include/boost/optional/optional_fwd.hpp
@@ -10,7 +10,7 @@
 //  fernando_cacciola@hotmail.com
 //
 // Revisions:
-// 27 Apr 2008 (added forward declaration of boost::swap overload) Niels Dekker
+// 10 May 2008 (added swap related forward declaration) Niels Dekker
 // 
 #ifndef BOOST_OPTIONAL_OPTIONAL_FWD_FLC_19NOV2002_HPP
 #define BOOST_OPTIONAL_OPTIONAL_FWD_FLC_19NOV2002_HPP
@@ -21,6 +21,8 @@ template<class T> class optional ;
 
 template<class T> void swap ( optional<T>& , optional<T>& ) ;
 
+template<class T> struct optional_swap_should_use_default_constructor ;
+
 } // namespace boost
 
 #endif