diff --git a/src/northsouthbridge/sis/630/ipl.S b/src/northsouthbridge/sis/630/ipl.S
index e4e3f59bab..b5bf189bdb 100644
--- a/src/northsouthbridge/sis/630/ipl.S
+++ b/src/northsouthbridge/sis/630/ipl.S
@@ -23,7 +23,8 @@
  *	1. SiS 630 Specification
  *	2. System Management Bus Specification Rev 1.1
  *	3. PC SDRAM Serial Presence Detect (SPD) Specification Rev 1.2B
- *	4. Booting From the DiskOnChip Millennium
+ *	4. Booting From the DiskOnChip Millennium, M-Systems Application Note Ap-DOC-044
+ *	   APR-2000, 93-SR-001-44-7L REV. 1.0
  *
  * $Id$
  */