add compat note
diff --git a/Misc/NEWS b/Misc/NEWS
index 6cf0050..93b7494 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -180,6 +180,8 @@
 Library
 -------
 
+- UserDict is now an new-style class.
+
 - Issue #6963: Added "maxtasksperchild" argument to multiprocessing.Pool,
   allowing for a maximum number of tasks within the pool to be completed by
   the worker before that worker is terminated, and a new one created to