diff --git a/avr/modules/uart_hw/lowlevel.asm b/avr/modules/uart_hw/lowlevel.asm
index f12d89b..e223100 100644
--- a/avr/modules/uart_hw/lowlevel.asm
+++ b/avr/modules/uart_hw/lowlevel.asm
@@ -114,7 +114,7 @@ UART_HW_Interface_EnsureReadBuffer_noBuf:
 ; @routine UART_HW_Interface_HandleMsgReceived
 ;
 ; @param Y pointer to interface data in SRAM
-; @clobbers R16 (R17, R18, R24, R25)
+; @clobbers R16, X (R17, R18, R24, R25)
 
 UART_HW_Interface_HandleMsgReceived:
   ; unset buffer