diff --git a/constants/SP2000.inc b/constants/SP2000.inc
index 189a42f..cc39209 100644
--- a/constants/SP2000.inc
+++ b/constants/SP2000.inc
@@ -62,7 +62,7 @@
 ;  ENDMODULE
 ;
  STRUCT	FDD_TABLE_s
-.DISK		BYTE	#80	; bit0 - fdd number, bit7 - 720/1440
+.DISK		BYTE	#80	; bit7 - 720/1440, bit0 - fdd number
 .SECTORS	BYTE	#12	;
 .HEADS		BYTE	#02	;
 .CYLINDL	BYTE	#50	;