diff --git a/DDSim/Helper/Action.py b/DDSim/Helper/Action.py
index 0fadf5efa7a895c1fa513a7798369aee849ec91a..5732da3402098d37d6360a858d698de7f94586bb 100644
--- a/DDSim/Helper/Action.py
+++ b/DDSim/Helper/Action.py
@@ -9,7 +9,7 @@ class Action( ConfigHelper ):
 
   >>> SIM = DD4hepSimulation()
   >>> SIM.action.tracker = "Geant4TrackerAction"
-  >>> SIM.action.tracker = "Geant4CalorimeterAction"
+  >>> SIM.action.calo    = "Geant4CalorimeterAction"
 
   for specific subdetectors specific sensitive detectors can be set based on pattern matching