diff --git a/README.md b/README.md
index 620d671..aabefeb 100644
--- a/README.md
+++ b/README.md
@@ -4,9 +4,12 @@
 
 Clone this repository, then :
 
-```
+```sh
 mbed deploy
+mbed toolchain GCC_ARM
+mbed target MTB_RAK811
 # modify lora.device-eui, lora.application-eui and lora.application-key in mbed_app.json
+# modify mbed_settings.py to set gcc arm path if needed
 mbed compile --profile mbed-os/tools/profiles/release.json
 ```