#10166: rewrite self-recursion to iteration in pstats.Stats.add().  Also add a unittest and a stats test file.
diff --git a/Misc/NEWS b/Misc/NEWS
index a93cad9..f5a7b02 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -43,6 +43,8 @@
 Library
 -------
 
+- Issue #10166: Avoid recursion in pstats Stats.add() for many stats items.
+
 - Issue #10163: Skip unreadable registry keys during mimetypes
   initialization.