diff --git a/doc/type_traits.qbk b/doc/type_traits.qbk
index 00ddce2..59d96bb 100644
--- a/doc/type_traits.qbk
+++ b/doc/type_traits.qbk
@@ -1305,9 +1305,9 @@ the same thing as a /pointer to a function/.
 [[`function_traits<long (int, long, double, void*)>::arity`] [An integral constant expression that has the value 4.]]
 [[`function_traits<void (void)>::result_type`] [The type `void`.]]
 [[`function_traits<long (int)>::result_type`] [The type `long`.]]
-[[`function_traits<long (int)>::arg0_type`] [The type `int`.]]
-[[`function_traits<long (int, long, double, void*)>::arg3_type`] [The type `void*`.]]
-[[`function_traits<long (int, long, double, void*)>::arg4_type`] [A compiler error: there is no `arg4_type` since there are only three arguments.]]
+[[`function_traits<long (int)>::arg1_type`] [The type `int`.]]
+[[`function_traits<long (int, long, double, void*)>::arg4_type`] [The type `void*`.]]
+[[`function_traits<long (int, long, double, void*)>::arg5_type`] [A compiler error: there is no `arg4_type` since there are only three arguments.]]
 [[`function_traits<long (*)(void)>::arity`] [A compiler error: argument type is a /function pointer/, and not a /function type/.]]
 
 ]