diff --git a/README.md b/README.md
index 3f2e0b8..0966a27 100644
--- a/README.md
+++ b/README.md
@@ -40,9 +40,9 @@ This script opens a browser window where you can log in to your Google account a
 
 ## Usage
 
-Run `fitsync.py` to download data from Fitbit and upload to Google,
+Use the `patch` command to download data from Fitbit and upload to Google,
 
-    $ python fitsync.py
+    $ python fitsync.py patch
 
 Use the `delete` command to remove data from Google,
 
@@ -52,6 +52,11 @@ Use the `get` command to see the data stored in Google,
 
     $ python fitsync.py get
 
+There are a few options supported,
+
+    $ python fitsync.py --help
+    
+
 ## See your data
 
 To view weight data on [Google Fit](https://fit.google.com),
diff --git a/fitsync.py b/fitsync.py
old mode 100644
new mode 100755
index 625f314..bdb03cc
--- a/fitsync.py
+++ b/fitsync.py
@@ -1,7 +1,11 @@
+#!/usr/bin/env python
+
 import httplib2
 import sys
 import time
 import yaml
+import argparse
+import logging
 
 import fitbit
 from apiclient.discovery import build
@@ -14,17 +18,20 @@ POUNDS_PER_KILOGRAM = 2.20462
 
 TIME_FORMAT = "%a, %d %b %Y %H:%M:%S"
 
-
-def GetFitbitClient():
-  credentials = yaml.load(open('fitbit.yaml'))
+def GetFitbitClient(filename):
+  logging.debug("Creating Fitbit client")
+  credentials = yaml.load(open(filename))
   client = fitbit.Fitbit(**credentials)
+  logging.debug("Fitbit client created")
   return client
 
 
-def GetGoogleClient():
-  credentials = Storage('google.json').get()
+def GetGoogleClient(filename):
+  logging.debug("Creating Google client")
+  credentials = Storage(filename).get()
   http = credentials.authorize(httplib2.Http())
   client = build('fitness', 'v1', http=http)
+  logging.debug("Google client created")
   return client
 
 
@@ -57,12 +64,23 @@ def GetDataSourceId(dataSource):
 
 
 def main():
-  fitbitClient = GetFitbitClient()
+  parser = argparse.ArgumentParser("Transfer Fitbit weight data to Google Fit")
+  parser.add_argument("command", choices=('patch', 'get', 'delete'), help="What to do")
+  parser.add_argument("-d", "--debug", action="count", default=0, help="Increase debugging level")
+  parser.add_argument("-g", "--google-creds", default="google.json", help="Google credentials file")
+  parser.add_argument("-f", "--fitbit-creds", default="fitbit.yaml", help="Fitbit credentials file")
+  args = parser.parse_args()
+
+  debugLevel = logging.WARNING - (args.debug * 10)
+  logging.basicConfig(level=max(debugLevel, 0))
+  logging.root.name = "fitsync"
+
+  fitbitClient = GetFitbitClient(args.fitbit_creds)
 
   devices = fitbitClient.get_devices()
   (scale,) = (device for device in devices if device['type'] == 'SCALE')
 
-  fitbitBodyweight = fitbitClient.get_bodyweight(period='30d')
+  fitbitBodyweight = fitbitClient.get_bodyweight(period='1m')
   fitbitWeightLogs = fitbitBodyweight['weight']
   fitbitWeightLogTimes = [log['logId'] / 1000 for log in fitbitWeightLogs]
 
@@ -72,7 +90,7 @@ def main():
   googleWeightLogs = [FitbitWeightToGoogleWeight(log)
                         for log in fitbitWeightLogs]
 
-  googleClient = GetGoogleClient()
+  googleClient = GetGoogleClient(args.google_creds)
 
   dataSource = dict(
     type='raw',
@@ -121,12 +139,8 @@ def main():
       set(point['startTimeNanos'] for point in left['point']) -
       set(point['startTimeNanos'] for point in right['point']))
 
-  command = 'patch'
-  if len(sys.argv) > 1:
-    command = sys.argv[1]
-
   # Get weight dataset.
-  if command == 'get':
+  if args.command == 'get':
     data = GetData()
     numpoints = 0
     for point in data['point']:
@@ -136,22 +150,22 @@ def main():
       readableTime = time.strftime(TIME_FORMAT, time.localtime(startTimeSecs))
       weightKgs = float(fpVal)
       weightLbs = float(fpVal) * POUNDS_PER_KILOGRAM
-      print "%.1f lbs ( %.2f kgs ), %s" % (weightLbs, weightKgs, readableTime)
+      print("%.1f lbs ( %.2f kgs ), %s" % (weightLbs, weightKgs, readableTime))
       numpoints += 1
-    print "Total %d points (in Google Fit)" % numpoints
+    print("Total %d points (in Google Fit)" % numpoints)
 
   # Delete weight dataset.
-  elif command == 'delete':
+  elif args.command == 'delete':
     dataPrior = GetData()
     googleClient.users().dataSources().datasets().delete(
       userId='me',
       dataSourceId=dataSourceId,
       datasetId=datasetId).execute()
     dataPost = GetData()
-    print "Deleted %d points (from Google Fit)" % PointsDifference(dataPrior, dataPost)
+    print("Deleted %d points (from Google Fit)" % PointsDifference(dataPrior, dataPost))
 
   # Upload weight dataset.  
-  elif command == 'patch':
+  elif args.command == 'patch':
     dataPrior = GetData()
     googleClient.users().dataSources().datasets().patch(
       userId='me',
@@ -164,10 +178,8 @@ def main():
         point=googleWeightLogs,
       )).execute()
     dataPost = GetData()
-    print "Added %d points (to Google Fit)" % PointsDifference(dataPost, dataPrior)
+    print("Added %d points (to Google Fit)" % PointsDifference(dataPost, dataPrior))
 
-  else:
-    print "bad command"
 
 
 def PointInData(startTimeNanos, data):
@@ -179,3 +191,4 @@ def PointInData(startTimeNanos, data):
 
 if __name__ == '__main__':
   main()
+