diff --git a/CHANGES b/CHANGES
index 05a776a16e..2ab97a05e1 100644
--- a/CHANGES
+++ b/CHANGES
@@ -1,3 +1,7 @@
+6252.	[test]		Python system tests have to be executed by invoking
+			pytest directly. Executing them with the legacy test
+			runner is no longer supported. [GL #4250]
+
 6250.	[bug]		The wrong covered value was being set by
 			dns_ncache_current for RRSIG records in the returned
 			rdataset structure. This resulted in TYPE0 being