diff --git a/gpsreader.py b/gpsreader.py
old mode 100644
new mode 100755
index 52c589e..0bfe77a
--- a/gpsreader.py
+++ b/gpsreader.py
@@ -1,25 +1,36 @@
-# https://56k.es/fanta/utilizando-un-modulo-gps-usb-barato-en-gnulinux/
-# apt install python3-nmea2 python3-serial
-# NMEA 0183 PROTOCOL: https://www.serialmon.com/protocols/nmea0183.shtml
-#        ('Timestamp', 'timestamp', timestamp),
-#        ('Latitude', 'lat'),
-#        ('Latitude Direction', 'lat_dir'),
-#        ('Longitude', 'lon'),
-#        ('Longitude Direction', 'lon_dir'),
-#        ('GPS Quality Indicator', 'gps_qual', int),
-#        ('Number of Satellites in use', 'num_sats'),
-#        ('Horizontal Dilution of Precision', 'horizontal_dil'),
-#        ('Antenna Alt above sea level (mean)', 'altitude', float),
-#        ('Units of altitude (meters)', 'altitude_units'),
-#        ('Geoidal Separation', 'geo_sep'),
-#        ('Units of Geoidal Separation (meters)', 'geo_sep_units'),
-#        ('Age of Differential GPS Data (secs)', 'age_gps_data'),
-#        ('Differential Reference Station ID', 'ref_station_id'),
+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+
+"""
+https://56k.es/fanta/utilizando-un-modulo-gps-usb-barato-en-gnulinux/
+apt install python3-nmea2 python3-serial
+NMEA 0183 PROTOCOL: https://www.serialmon.com/protocols/nmea0183.shtml
+
+'Timestamp', 'timestamp'
+'Latitude', 'lat'
+'Latitude Direction', 'lat_dir'
+'Longitude', 'lon'
+'Longitude Direction', 'lon_dir'
+'GPS Quality Indicator', 'gps_qual', int
+'Number of Satellites in use', 'num_sats'
+'Horizontal Dilution of Precision', 'horizontal_dil'
+'Antenna Alt above sea level (mean)', 'altitude', float
+'Units of altitude (meters)', 'altitude_units'
+'Geoidal Separation', 'geo_sep'
+'Units of Geoidal Separation (meters)', 'geo_sep_units'
+'Age of Differential GPS Data (secs)', 'age_gps_data'
+'Differential Reference Station ID', 'ref_station_id'
+"""
 
 import io
+import os
+import sys
 import pynmea2
 import serial
 
+if os.geteuid() != 0:
+    sys.exit("You need to have root privileges to run this script.\nPlease try again, this time using 'sudo' for example. Exiting.")
+
 ser = serial.Serial('/dev/ttyACM0', 9600, timeout=5.0)
 sio = io.TextIOWrapper(io.BufferedRWPair(ser, ser))