diff --git a/chch-power.py b/chch-power.py
index f04d64f..8967e57 100644
--- a/chch-power.py
+++ b/chch-power.py
@@ -29,6 +29,8 @@ def switch_unpressed(event):
             switch_verylongpressed(event)
     pin_last_rise_date[event.pin_num] = 0
 
+# toggle current room's power with a short and a long press
+# call a script with two short and a long press
 def switch_longpressed(event):
     shortpress_delay = pin_last_rise_date[event.pin_num] - pin_last_shortpress[event.pin_num]
     if shortpress_delay > inter_press_max_delay:
@@ -36,8 +38,11 @@ def switch_longpressed(event):
     elif pin_shortpress_count[event.pin_num] == 1:
         event.chip.output_pins[event.pin_num].toggle()
     elif pin_shortpress_count[event.pin_num] == 2:
-        call(["/root/chch-power/light.sh"])
+        if event.pin_num == 0:
+            call(["/root/chch-power/light.sh"])
 
+# switch all power off with a very long press
+# switch all power on with a short and a very long press
 def switch_verylongpressed(event):
     shortpress_delay = pin_last_rise_date[event.pin_num] - pin_last_shortpress[event.pin_num]
     if shortpress_delay > inter_press_max_delay: