diff --git a/GPS-Sim.md b/GPS-Sim.md
index e906d55..e2b5c0a 100644
--- a/GPS-Sim.md
+++ b/GPS-Sim.md
@@ -1,9 +1,9 @@
 This app allows you to broadcast GPS baseband signal data streams. You can use [gps-sdr-sim](https://github.com/osqzss/gps-sdr-sim) to generate data for this app.  
 
 ## Example
-`gps-sdr-sim -e brdc3540.14n -l 30.286502,120.032669,100 -b 8`
+`gps-sdr-sim -e brdc3540.14n -l LAT,LONG,HEIGHT -o BBD_NNNN.C8`
 
-That will create a `gpssim.bin` file that you rename to `BBD_NNNN.C8` and then create `BBD_NNNN.TXT` with:
+That will create `BBD_NNNN.C8` and then create `BBD_NNNN.TXT` with:
 ```
 sample_rate=2600000
 center_frequency=1575420000