diff --git a/include/boost/type_traits/function_traits.hpp b/include/boost/type_traits/function_traits.hpp
index b336c78..923eaf8 100644
--- a/include/boost/type_traits/function_traits.hpp
+++ b/include/boost/type_traits/function_traits.hpp
@@ -24,6 +24,10 @@
 #endif
 //
 // is a type a function?
+// Please note that this implementation is unnecessarily complex:
+// we could just use is_convertible<T*, const volatile void*>::value,
+// except that some compilers erroneously allow conversions from
+// function pointers to void*.
 //
 namespace boost{
 namespace detail{
@@ -103,6 +107,7 @@ struct is_function_helper
 {
    static T* t;
    BOOST_STATIC_CONSTANT(bool, value = sizeof(is_function_tester(t)) == sizeof(::boost::type_traits::yes_type));
+   //BOOST_STATIC_CONSTANT(bool, value = (::boost::is_convertible<T*, const volatile void*>::value));
 };
 
 #endif