diff --git a/doc/release.notes b/doc/release.notes
index 719452032f8722557d7cf27daf1041acf1eb7bf6..11020da6a93f44e881117bd0a340463b58159018 100644
--- a/doc/release.notes
+++ b/doc/release.notes
@@ -7,6 +7,14 @@ DD4hep  ----  Release Notes
 | v00-12 |  
  --------   
 
+S.Lu:
+-----
+  - Added a switch for BirksLaw to Geant4StepHandler. 
+    For backward compatable, by default, do not apply BirksLaw, and apply BirksLaw with call 'doApplyBirksLaw()'.
+    added optional Geant4ScintillatorCalorimeterAction
+  - Added one 'Geant4ScintillatorCalorimeterAction' into DDG4 plugins Geant4SDActions for  scintillator to take 
+    Geant4 BirksLaw effect as sensitive detector active layer.
+
 F.Gaede
 -------
    - added SurfaceManager class that holds maps of surfaces for