diff --git a/Variant-USART.md b/Variant-USART.md
index e2341c8..5145395 100644
--- a/Variant-USART.md
+++ b/Variant-USART.md
@@ -18,6 +18,7 @@ Commands are send as binary frames with following structure:<br />
 - Speed(signed int16) : Speed  with range -1000 to 1000 or Throttle(hovercar) with range 0 to 1000
 - Checksum(unsigned int16) : XOR checksum
 
+The least significant byte comes first (little endian).<br>
 The FOC firmware will discard frames that are not starting with proper start frame and not ending with correct checksum.<br />
 A timeout will be triggered if no correct frame is received during the time specified with parameter SERIAL_TIMEOUT in config.h (160ms by default).<br />
 
@@ -37,6 +38,8 @@ Following feedback is sent:
 - Led(unsigned int16) : Used to control the leds on the sideboard
 - Checksum(unsigned int16) : XOR checksum
 
+The least significant byte comes first (little endian).
+
 ## Troubleshooting:
 
 If the board is [beeping](https://github.com/EmanuelFeru/hoverboard-firmware-hack-FOC/wiki/Diagnostics)