diff --git a/app/light.py b/app/light.py
index 39a77e3..0b55862 100644
--- a/app/light.py
+++ b/app/light.py
@@ -118,8 +118,8 @@ def btnStart_clicked(self):
         # goto start of scan range
         self.stage.move(self.PresentPosition)
 
-        # wait for stage controller to arrive
-
+        # wait for stage controller to arrive.
+        #TODO: this part is not correct. Fix it!!!
         for i in range(length_of_scan):
 
             # Check for stop flag