Update README.md
Specified that the cross-compiler installation command is for Linux.
@@ -29,7 +29,7 @@ Then you have to include `ulab` in the compilation process by editing `mpconfigp
#define MODULE_ULAB_ENABLED (1)
```
-This line will inform the compiler that you want `ulab` in the resulting firmware. If you don't have the cross-compiler installed, your might want to do that now by executing
+This line will inform the compiler that you want `ulab` in the resulting firmware. If you don't have the cross-compiler installed, your might want to do that now, for instance on Linux by executing
```
sudo apt-get install gcc-arm-none-eabi
