diff --git a/SYS/KERNEL.S.RDR.txt b/SYS/KERNEL.S.RDR.txt
index 8a5307e0..953313b1 100644
--- a/SYS/KERNEL.S.RDR.txt
+++ b/SYS/KERNEL.S.RDR.txt
@@ -14,6 +14,15 @@ AUTO 6
 *  Out :
 *   A = hMem To newly created BufRdr
 *--------------------------------------
+* S.BUFRDR STRUCT
+*--------------------------------------
+S.BUFRDR.hMEM		.EQ 0
+S.BUFRDR.DELIM		.EQ 1
+S.BUFRDR.LEN		.EQ 2
+S.BUFRDR.IDX		.EQ 4
+*
+S.BUFRDR.SIZE		.EQ 6
+*--------------------------------------
 S.NewBufRdr		>PUSHWI S.BUFRDR.SIZE
 				>PUSHBI 0				0 = no option
 				jsr S.GetMem