diff --git a/include/boost/smart_ptr/detail/sp_noexcept.hpp b/include/boost/smart_ptr/detail/sp_noexcept.hpp
index 790af2ce16..3b0d04ed50 100644
--- a/include/boost/smart_ptr/detail/sp_noexcept.hpp
+++ b/include/boost/smart_ptr/detail/sp_noexcept.hpp
@@ -15,13 +15,12 @@
 //  See accompanying file LICENSE_1_0.txt or copy at
 //  http://www.boost.org/LICENSE_1_0.txt
 
-#include <boost/config.hpp>
 
-// BOOST_SP_NOEXCEPT
+// BOOST_SP_NOEXCEPT (obsolete, only retained for compatibility)
 
-// #define BOOST_SP_NOEXCEPT noexcept
+#define BOOST_SP_NOEXCEPT noexcept
 
-// BOOST_SP_NOEXCEPT_WITH_ASSERT
+// BOOST_SP_NOEXCEPT_WITH_ASSERT (noexcept, unless a user assertion handler is present)
 
 #if defined(BOOST_DISABLE_ASSERTS) || ( defined(BOOST_ENABLE_ASSERT_DEBUG_HANDLER) && defined(NDEBUG) )