diff --git a/Source/HBIOS/sio.asm b/Source/HBIOS/sio.asm
index c7e23e01..73f5d189 100644
--- a/Source/HBIOS/sio.asm
+++ b/Source/HBIOS/sio.asm
@@ -921,7 +921,7 @@ SIO_INITPRT:
 	XOR	A			; SIGNAL SUCCESS
 	RET				; RETURN
 ;
-; THE SIO IS A LITTLE PRICKLY ABOUT THE ORDER IN WHICH REGSITERS ARE
+; THE SIO IS A LITTLE PRICKLY ABOUT THE ORDER IN WHICH REGISTERS ARE
 ; WRITTEN DURING CONFIGURATION.  THE TABLE BELOW IS USED TO SETUP
 ; THE REGISTER VALUES AND THEN THE ENTIRE TABLE CAN BE SPIT OUT.
 ;