Index: boost/type_traits/intrinsics.hpp
===================================================================
--- boost/type_traits/intrinsics.hpp	(revision 73838)
+++ boost/type_traits/intrinsics.hpp	(working copy)
@@ -22,7 +22,7 @@
 // (these should largely ignore cv-qualifiers)
 // BOOST_IS_UNION(T) should evaluate to true if T is a union type
 // BOOST_IS_POD(T) should evaluate to true if T is a POD type
-// BOOST_IS_EMPTY(T) should evaluate to true if T is an empty struct or union
+// BOOST_IS_EMPTY(T) should evaluate to true if T is an empty class type and not a union type
 // BOOST_HAS_TRIVIAL_CONSTRUCTOR(T) should evaluate to true if "T x;" has no effect
 // BOOST_HAS_TRIVIAL_COPY(T) should evaluate to true if T(t) <==> memcpy
 // BOOST_HAS_TRIVIAL_ASSIGN(T) should evaluate to true if t = u <==> memcpy
@@ -36,7 +36,7 @@
 //
 // BOOST_IS_ABSTRACT(T) true if T is an abstract type
 // BOOST_IS_BASE_OF(T,U) true if T is a base class of U
-// BOOST_IS_CLASS(T) true if T is a class type
+// BOOST_IS_CLASS(T) true if T is a class type and not a union type
 // BOOST_IS_CONVERTIBLE(T,U) true if T is convertible to U
 // BOOST_IS_ENUM(T) true is T is an enum
 // BOOST_IS_POLYMORPHIC(T) true if T is a polymorphic type