Add CHANGES note for [GL #4250]

diff --git a/CHANGES b/CHANGES
index 9497883e3ff6fcdc9d203e64589aa5d05b76ce8f..6666cc80f69af683f693ac79c460719fd165c3fc 100644 (file)
--- 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]
+
 6251.  [bug]           Interating a hashmap could return the same element
                        twice. [GL #3422]