diff --git a/include/boost/range/begin.hpp b/include/boost/range/begin.hpp
index e8251c9..9abf313 100755
--- a/include/boost/range/begin.hpp
+++ b/include/boost/range/begin.hpp
@@ -41,6 +41,11 @@ namespace range_detail
     inline BOOST_DEDUCED_TYPENAME range_iterator<C>::type
     range_begin( C& c )
     {
+        //
+        // If you get a compile-error here, it is most likely because
+        // you have not implemented range_begin() properly in
+        // the namespace of C
+        //
         return c.begin();
     }
 
diff --git a/include/boost/range/concepts.hpp b/include/boost/range/concepts.hpp
index d9c122f..53a88dc 100755
--- a/include/boost/range/concepts.hpp
+++ b/include/boost/range/concepts.hpp
@@ -82,7 +82,6 @@ namespace boost {
         T a;
         range_iterator i;
         range_const_iterator ci;
-        bool b;
     };
 
     //! Check if a type T models the ForwardRange range concept.
diff --git a/include/boost/range/end.hpp b/include/boost/range/end.hpp
index be2f495..b777a55 100755
--- a/include/boost/range/end.hpp
+++ b/include/boost/range/end.hpp
@@ -42,6 +42,11 @@ namespace range_detail
         inline BOOST_DEDUCED_TYPENAME range_iterator<C>::type
         range_end( C& c )
         {
+            //
+            // If you get a compile-error here, it is most likely because
+            // you have not implemented range_begin() properly in
+            // the namespace of C
+            //
             return c.end();
         }