diff --git a/src/southbridge/amd/pi/hudson/lpc.c b/src/southbridge/amd/pi/hudson/lpc.c
index 77d39c5..784147c 100644
--- a/src/southbridge/amd/pi/hudson/lpc.c
+++ b/src/southbridge/amd/pi/hudson/lpc.c
@@ -354,7 +354,9 @@
 };
 
 static const unsigned short pci_device_ids[] = {
+	/* PCI device ID is used on all discrete FCHs and Family 16h Models 00h-3Fh */
 	PCI_DEVICE_ID_AMD_SB900_LPC,
+	/* PCI device ID is used on all integrated FCHs except Family 16h Models 00h-3Fh */
 	PCI_DEVICE_ID_AMD_CZ_LPC,
 	0
 };