diff --git a/src/sbbs3/sbbsdefs.h b/src/sbbs3/sbbsdefs.h
index 6ec5d4919d62ddcfa7a17d24a500611418e6ff48..03aeceeef264d19d0b839d27b989c1c91dd3bf47 100644
--- a/src/sbbs3/sbbsdefs.h
+++ b/src/sbbs3/sbbsdefs.h
@@ -220,10 +220,11 @@ typedef struct {
 #define NMAIL_FILE		(1<<5)		/* Allow file attachments */
 #define NMAIL_DIRECT	(1<<6)		/* Default netmail to direct */
 
-									/* Bit values for sub_cfg and sav_sub_cfg	*/
-#define SUB_CFG_NSCAN	0x0005		/* bits 0 and 2								*/
-#define SUB_CFG_SSCAN	0x0002		/* bit 1									*/
-#define SUB_CFG_YSCAN	0x0100		/* bit 9 (bits 9-15 default to OFF)			*/
+									/* Bit values for subscan_t.cfg and sav_cfg	*/
+#define SUB_CFG_NSCAN	0x0005		/* Auto-scan for new messages				*/
+#define SUB_CFG_SSCAN	0x0002		/* Auto-scan for unread messages to you		*/
+#define SUB_CFG_YSCAN	0x0100		/* Auto-scan for new messages to you only	*/
+									/* (bits 8-15 default to off)				*/
 
 									/* Bit values for sub[x].misc */
 #define SUB_QNET		(1L<<3) 	/* Sub-board is netted via QWK network */