diff --git a/worker.py b/worker.py
index 8405b8b..811b792 100644
--- a/worker.py
+++ b/worker.py
@@ -14,6 +14,11 @@ def do(self,timestamp):
                 self.fn()
                 exit(0)
             else:
+                # Don't need to wait
+                # have handler to get terminated process when SIGCHLD is raised
+                # in arrange_schedule.py 
+
+                #TODO find out why there is still zombie process
                 return 0
         except Exception as e:
             #TODO logging the error message