diff --git a/Changelog b/Changelog
index fdd6af530d7a908fe316ff318a6de3e8daf87ddf..fdeab1fa81a4f63f4457c77819a04b02671bb6a4 100644
--- a/Changelog
+++ b/Changelog
@@ -17,6 +17,9 @@
 Open Source Release <next-release>
 ##################################
 
+o!  Kernel    [2019/08/02] Functions over visitor's behaviors have been moved
+              from Cil into a new module Visitor_behavior. Apply the migration
+              script potassium2calcium.sh to update your plug-ins automatically.
 o!  Sparecode [2019/07/26] Removed from Db. Use proper Sparecode API instead.
 -!  Kernel    [2019/07/24] OCaml version greater than or equal to 4.05.0 required.
 -   Kernel    [2019/07/24] Improve placeholders handling in -cpp-command