1 files changed, 4 insertions, 0 deletions
diff --git a/Misc/NEWS b/Misc/NEWS
index 27ece4d..a8c2749 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -81,6 +81,10 @@ Core and Builtins
 Library
 -------
 
+- Issue #9559: If messages were only added, a new file is no longer
+  created and renamed over the old file when flush() is called on an
+  mbox, MMDF or Babyl mailbox.
+
 - Issue #14653: email.utils.mktime_tz() no longer relies on system
   mktime() when timezone offest is supplied.