diff --git a/script/Marco/power-supply.py b/script/Marco/power-supply.py
index 12562ae..602dd4f 100644
--- a/script/Marco/power-supply.py
+++ b/script/Marco/power-supply.py
@@ -6,7 +6,7 @@ sleep(0.5)
 
 #TODO: Set the diplay names of positioners and detectors
 #ManualScan(writables, readables, start = None, end = None, steps = None, relative = False)
-scan = ManualScan(['time'], ['SetVA', 'ActualVA'] , [0.0], [50.0], [10])
+scan = ManualScan(['time'], ['SetVA', 'ActualVA'] , [0.0], [50.0], [10]) #????????????????????? what does this really do? what is writeables? what is readables?
 scan.start()
 
 #Creating channels: dimension 1
@@ -44,7 +44,7 @@ for setpoint1 in frange(0.0, 50.0, 10.0, True):
         #scan.append ([setpoint1], [readback1], [detector1, detector2])
 
         #append(setpoints, positions, values)
-        scan.append ([detector1], [detector1], [readback1, detector2])
+        scan.append ([detector1], [detector1], [readback1, detector2]) #?????????????????????? what is setpoint? what is position?
         print 'detector1'
         print detector1
         sleep( 0.1 ) # Settling time
@@ -58,3 +58,5 @@ scan.end()
 #Post-actions
 caput('PO2DV-NCS-VHQ1:Set-VA', '0')
 #sleep(4.0)
+
+#??????????????????????????? Device modeling: how can I modelise a Power Supply, for example?