Updated FreeRTOS section in README.md

README.md

@@ -135,7 +135,7 @@ stm32-cmake contains additional CMake modules for finding and configuring variou
 
 ## FreeRTOS
 
-[cmake/FindFreeRTOS](cmake/FindFreeRTOS) - finds FreeRTOS sources in location specified by `FREERTOS_PATH` (*default*: `/opt/FreeRTOS`) variable and format them as `IMPORTED` targets. 
+[cmake/FindFreeRTOS](cmake/FindFreeRTOS) - finds FreeRTOS sources in location specified by `FREERTOS_PATH` (*default*: `/opt/FreeRTOS`) variable and format them as `IMPORTED` targets. `FREERTOS_PATH` can be either the path to the whole [FreeRTOS/FreeRTOS](https://github.com/FreeRTOS/FreeRTOS) github repo, or the path to FreeRTOS-Kernel (usually located in the subfolder `FreeRTOS` on a downloaded release)
 Typical usage:
 
 ```