diff --git a/Compiling-and-flashing-the-firmware.md b/Compiling-and-flashing-the-firmware.md
index b21b0fa..239257a 100644
--- a/Compiling-and-flashing-the-firmware.md
+++ b/Compiling-and-flashing-the-firmware.md
@@ -66,6 +66,10 @@ openocd -f interface/stlink-v2.cfg -f target/stm32f1x.cfg -c flash "write_image
 ```
 brew install stlink
 ```
+You may also need to install `arm-none-eabi-gcc`:
+```
+brew install armmbed/formulae/arm-none-eabi-gcc
+```
 - open a terminal in the repo check-out folder and if you have definded the variant in [config.h](/Inc/config.h) type:
 ```
 make