diff --git a/constants/dss_equ.inc b/constants/dss_equ.inc
index 1f89b62..d7790ec 100644
--- a/constants/dss_equ.inc
+++ b/constants/dss_equ.inc
@@ -236,7 +236,7 @@ Dss:
 ;.Mouse.RESERVED	EQU	#0D
 .Mouse.GetSensitive	EQU	#0E
 .Mouse.SetSensitive	EQU	#0F
-.Mouse.GetPackets	EQU	#80
+.Mouse.GetPackets	EQU	#80	; Interrupt routine
 .Mouse.SetVideoMode	EQU	#81
 ;.Mouse.RESERVED	EQU	#82
 .Mouse.RefreshCursor	EQU	#83