diff --git a/doc/manual.txt b/doc/manual.txt
index 8a7cfba54b..b39efb7407 100644
--- a/doc/manual.txt
+++ b/doc/manual.txt
@@ -1089,7 +1089,8 @@ types with no overhead and few abstraction possibilities. The constructor ``()``
 can be used to construct tuples. The order of the fields in the constructor
 must match the order of the tuple's definition. Different tuple-types are
 *equivalent* if they specify the same fields of the same type in the same
-order.
+order. The *names* of the fields also have to be identical but this might
+change in a future version of the language.
 
 The assignment operator for tuples copies each component.
 The default assignment operator for objects copies each component. Overloading