diff --git a/util/superiotool/fintek.c b/util/superiotool/fintek.c
index 1742d1615a..0a02ef3a13 100644
--- a/util/superiotool/fintek.c
+++ b/util/superiotool/fintek.c
@@ -97,7 +97,7 @@ static const struct superio_registers reg_table[] = {
 		{0x4, "Hardware monitor",
 			{0x30,0x60,0x61,0x70,EOT},
 			{0x00,0x02,0x95,0x00,EOT}},
-		{0x5, "Keyboard",
+		{0x5, "Keyboard", /* Only documented on F71872F/FG. */
 			{0x30,0x60,0x61,0x70,0x72,0xf0,0xf1,EOT},
 			{0x01,0x00,0x60,0x00,0x00,0x83,0x00,EOT}},
 		{0x6, "GPIO",