diff --git a/taskflow/examples/build_a_car.py b/taskflow/examples/build_a_car.py
index a3291817..cb952f39 100644
--- a/taskflow/examples/build_a_car.py
+++ b/taskflow/examples/build_a_car.py
@@ -167,7 +167,7 @@ engine = taskflow.engines.load(flow, store={'spec': spec.copy()})
 # flow_watch function for flow state transitions, and registers the
 # same all (ANY) state transitions for task state transitions.
 engine.notifier.register(ANY, flow_watch)
-engine.task_notifier.register(ANY, task_watch)
+engine.atom_notifier.register(ANY, task_watch)
 
 eu.print_wrapped("Building a car")
 engine.run()
@@ -180,7 +180,7 @@ spec['doors'] = 5
 
 engine = taskflow.engines.load(flow, store={'spec': spec.copy()})
 engine.notifier.register(ANY, flow_watch)
-engine.task_notifier.register(ANY, task_watch)
+engine.atom_notifier.register(ANY, task_watch)
 
 eu.print_wrapped("Building a wrong car that doesn't match specification")
 try: