diff --git a/gcalsync.py b/gcalsync.py
index 70ce3fb..57af902 100644
--- a/gcalsync.py
+++ b/gcalsync.py
@@ -1,14 +1,15 @@
 from src.date_period import DatePeriod
 from src.calendar import Calendar
+import sys
 
-def main():
+def main(clientCalendarId):
     twCalendar = Calendar("tw", "primary")
     
-    clientCalendarId = "" ## Put here the ID of your client calendar visible from your TW account
-    ## use  twCalendar.printCalendars() to see all your calendars and find out this id. 
     clientCalendar = Calendar("tw", clientCalendarId )
 
     twCalendar.copyAllEventsFrom(clientCalendar, DatePeriod.weeks(1))
 
 if __name__ == '__main__':
-    main()
\ No newline at end of file
+    main(sys.argv[1])
+    ## Pass as first an single argument the ID of your client calendar visible from your TW account
+    ## use  twCalendar.printCalendars() to see all your calendars and find out this id. 
\ No newline at end of file