diff --git a/constants/SP2000.inc b/constants/SP2000.inc
index 8f983b2..2500d1a 100644
--- a/constants/SP2000.inc
+++ b/constants/SP2000.inc
@@ -1734,7 +1734,7 @@ Config_PG:
 .SectorsPerCylinderHigh		BYTE	; 6	SPCLH_H
 .DriveType			BYTE	; 7	DTYPE_H	
 .SectorSize			WORD	; 8
-.MediaParameters		BYTE	; 10	; bit0=1 removable, bit1=1 drive changed, bit7..2 reserved
+.MediaParameters		BYTE	; 10	; bit0=1 removable, bit1=1 drive changed, bit3=1 no media, bit7..3 reserved
 .PDT				BYTE	; 11	; Peripheral Device Type for ATAPI
 .RESERVED_2			BYTE	; 12
 .RESERVED_3			BYTE	; 13