diff --git a/Misc/NEWS b/Misc/NEWS
index ff42c1b..17b7833 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -12,6 +12,8 @@
 Core and builtins
 -----------------
 
+- sets and frozensets now have an isdisjoint() method.
+
 - optimize the performance of builtin.sum().
 
 - Fix warnings found by the new version of the Coverity checker.