diff --git a/Misc/NEWS b/Misc/NEWS
index f0e24b2..6ae2ac5 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -12,6 +12,8 @@
 Core and builtins
 -----------------
 
+- optimize the performance of builtin.sum().
+
 - Fix warnings found by the new version of the Coverity checker.
 
 - The enumerate() builtin function is no longer bounded to sequences smaller