diff --git a/SAS/TMSS/services/scheduling/lib/dynamic_scheduling.py b/SAS/TMSS/services/scheduling/lib/dynamic_scheduling.py
index 94cc81abf27a8ea16ccdec2b43756d45e0264093..810e1a1e6252487de600cb4014848c48ed72bb7a 100644
--- a/SAS/TMSS/services/scheduling/lib/dynamic_scheduling.py
+++ b/SAS/TMSS/services/scheduling/lib/dynamic_scheduling.py
@@ -228,6 +228,7 @@ class TMSSSchedulingUnitBlueprintDynamicSchedulingMessageHandler(TMSSEventMessag
         self._do_schedule_event = Event()
 
     def start_handling(self):
+        # start the background thread which waits until the _do_schedule_event event is set upon receiving to the correct TMSS EVentMessages.
         self._scheduling_thread = Thread(target=TMSSSchedulingUnitBlueprintDynamicSchedulingMessageHandler._scheduling_loop, kwargs={'self':self})
         self._scheduling_thread.daemon = True
         self._scheduling_thread_running = True