diff --git a/script/Devices/ImageStats.py b/script/Devices/ImageStats.py
index 340d23e..2cb86f4 100644
--- a/script/Devices/ImageStats.py
+++ b/script/Devices/ImageStats.py
@@ -139,7 +139,8 @@ class ImageStats(DeviceBase):
         self.source.addListener(self.listener)
     
     
-    def doUpdate(self):        
+    def doUpdate(self):     
+        print "Do update"   
         self.com_x_samples, self.com_y_samples = [], []
         self.rms_x_samples, self.rms_y_samples = [], []
         for i in range(self.num_images):