diff --git a/Misc/NEWS b/Misc/NEWS
index bc29eaa..19b8f1c 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -380,7 +380,10 @@
 - mailbox.py: Change MH.pack() to not lock individual message files; this
   wasn't consistent with existing implementations of message packing, and
   was buggy on some platforms.
-  
+
+- Bug #1633678: change old mailbox.UnixMailbox class to parse 
+  'From' lines less strictly.
+
 - Bug #1576241: fix functools.wraps() to work on built-in functions.
 
 - Patch #1574068: fix urllib/urllib2 to not insert line breaks when