diff --git a/README.md b/README.md
index 271cdbe..21bbe56 100644
--- a/README.md
+++ b/README.md
@@ -151,13 +151,15 @@ Recommendation: Nunchuck Breakout Board https://github.com/Jan--Henrik/hoverboar
 Most robust way for input is to use the ADC and potis. It works well even on 1m unshielded cable. Solder ~100k Ohm resistors between ADC-inputs and gnd directly on the mainboard. Use potis as pullups to 3.3V.
 
 ---
-## Examples
+## Example variants 
 
-This firmware offers currently 4 variants (selectable in platformio.ino):
+This firmware offers currently these variants (selectable in [platformio.ini](//platformio.ini) and / or config.h):
 - **VARIANT_ADC**: In this variant the motors are controlled by two potentiometers connected to the Left sensor cable (long wired)
-- **VARIANT_USART3**: In this variant the motors are controlled via Serial protocol on USART3 Right sensor cable (short wired). The commands can be sent from an Arduino. Check out the [hoverserial.ino](https://github.com/EmanuelFeru/hoverboard-firmware-hack-FOC/tree/master/02_Arduino/hoverserial) as an example sketch.
-- **HOVERCAR**: In this variant the motors are controlled by two pedals Brake and Throttle. Reverse is engaged by double tapping on the Brake pedal at standstill.
-- **TRANSPOTTER**: This build is for Transpotter which is a hoverboard based transportation system. For more details on how to build it check [here](https://github.com/NiklasFauth/hoverboard-firmware-hack/wiki/Build-Instruction:-TranspOtter) and [here](https://hackaday.io/project/161891-transpotter-ng).
+- **VARIANT_USART3**: In this variant the motors are controlled via serial protocol on USART3 right sensor cable (short wired). The commands can be sent from an Arduino. Check out the [hoverserial.ino](https://github.com/EmanuelFeru/hoverboard-firmware-hack-FOC/tree/master/02_Arduino/hoverserial) as an example sketch.
+- **VARIANT_HOVERCAR**: In this variant the motors are controlled by two pedals brake and throttle. Reverse is engaged by double tapping on the brake pedal at standstill.
+- **VARIANT_TRANSPOTTER**: This build is for transpotter which is a hoverboard based transportation system. For more details on how to build it check [here](https://github.com/NiklasFauth/hoverboard-firmware-hack/wiki/Build-Instruction:-TranspOtter) and [here](https://hackaday.io/project/161891-transpotter-ng).
+- **VARIANT_NUNCHUCK**: Wii Nunchuck offers one hand control for throttle, braking and steering. This was one of the first input device used for electric armchairs or bottle crates.
+- **VARIANT_PPM**: This is when you want to use a RC remote control with PPM Sum singnal 
 
 Of course the firmware can be further customized for other needs or projects.