diff --git a/Misc/NEWS b/Misc/NEWS
index 2a52337..096dcf5 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -12,6 +12,9 @@
 Core and Builtins
 -----------------
 
+- __isinstancecheck__ and __subclasscheck__ are now completely ignored on
+  classic classes and instances.
+
 - Issue #5994: the marshal module now has docstrings.
 
 - Issue #5981: Fix three minor inf/nan issues in float.fromhex: