Fix OrderedDict.setdefault() to work for subclasses that define __missing__().
diff --git a/Misc/NEWS b/Misc/NEWS
index b6b968a..9ddd9b3 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -20,6 +20,9 @@
 Library
 -------
 
+- Fix collections.OrderedDict.setdefault() so that it works in
+  subclasses that define __missing__().
+
 - Issue 10786: unittest.TextTestRunner default stream no longer bound at
   import time. `sys.stderr` now looked up at instantiation time. Fix contributed
   by Mark Roddy.