diff --git a/avr/common/ringbuffer_y.asm b/avr/common/ringbuffer_y.asm
index e4e2ec9..b887b3c 100644
--- a/avr/common/ringbuffer_y.asm
+++ b/avr/common/ringbuffer_y.asm
@@ -120,7 +120,7 @@ RingBufferY_Reset:
 ;
 ; @return CFLAG on success, cleared on error
 ; @return r16 byte read
-; @param Y pointer to start of interface data
+; @param Y  base address of ringbuffer struct
 ; @clobbers R17, R18, X
 
 RingBufferY_ReadByteGuarded: