Clarify that iteration is over headers, not Mime elements.
diff --git a/Misc/NEWS b/Misc/NEWS
index 617e815..b87f128 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -21,7 +21,8 @@
 
 Library
 -------
-- rfc822 Messages now support iteration.
+
+- rfc822 Messages now support iterating over the headers.
 
 - The (undocumented) tarfile.Tarfile.membernames has been removed;
   applications should use the getmember function.