diff --git a/README.md b/README.md
index 33d6484..d3316b2 100644
--- a/README.md
+++ b/README.md
@@ -29,10 +29,11 @@ you could build gps-sdr-sim from scratch, but I choose to use the binary provide
  Generate binary file to be transmitted by hackrf:
 
 ```
- $ gps-sdr-sim -b 8 -e ~/LOCATION_OF_YOUR_BRDC/brdc1460.20n -l 45.803304, 12.133697,100  
+ $ gps-sdr-sim -b 8 -e ~/LOCATION_OF_YOUR_BRDC/brdc1460.20n -l 45.803304,12.133697,100  
 ```
 
- The default option generates a 300sec (5 min) 'motion' file. This can be increased by using using the '-d' option. The last part is the location of your choosing. This will run for 300 seconds and generate a 'gpssim.bin' file.
+ The default option generates a 300sec (5 min) 'motion' file. This can be increased by using using the '-d' option. The last part is the location of your choosing (lat, long, altitude). This will run for 300 seconds and generate a 'gpssim.bin' file. **NOTE** the lat/long/alt should not contain any spaces, only commas.
+ 
 
 ### Spoof location