diff --git a/constants/SP2000.inc b/constants/SP2000.inc
index a1215ab..563e041 100644
--- a/constants/SP2000.inc
+++ b/constants/SP2000.inc
@@ -632,7 +632,7 @@ FDD_0           EQU     SYS_PAGE.FDD_0
 .HEADS          EQU     FDD_0+2
 .CYLINDL        EQU     FDD_0+3
 .CYLINDH        EQU     FDD_0+4
-.B_P_S          EQU     FDD_0+5
+.B_P_S          EQU     FDD_0+5	;WORD
 FDD_1           EQU     SYS_PAGE.FDD_1
 .DISK           EQU     FDD_1+0
 .F144           EQU     .DISK