Improve blurb message

srinivasreddy · srinivasreddy · commit 3ac53dad1879 · 2024-12-18T12:38:27.000+05:30
diff --git a/Misc/NEWS.d/next/Library/2024-12-11-17-44-36.gh-issue-127794.VwmRsp.rst b/Misc/NEWS.d/next/Library/2024-12-11-17-44-36.gh-issue-127794.VwmRsp.rst
@@ -1,2 +1,3 @@
 The :meth:`email.message.Message.add_header` method now validates header
-field names according to :rfc:`5322`.
+field names according to :rfc:`5322` when headers are added via add_header
+or __setitem__ and raises a ValueError if they contain invalid characters.
