Mention caching and better thread-safety for Lib/_strptime.py
diff --git a/Misc/NEWS b/Misc/NEWS
index 435dd64..d790fc8 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -21,6 +21,10 @@
 Library
 -------
 
+- _strptime.py now has a behind-the-scense caching mechanism for the most
+  recent TimeRE instance used along with the last five unique directive
+  patterns.  The overall module was also made more thread-safe.
+
 Tools/Demos
 -----------