diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index b12bacd..3845e3a 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -1121,9 +1121,11 @@
 			zone if it does not.
 
 	kgdboc=		[HW] kgdb over consoles.
-			Requires a tty driver that supports console polling.
-			(only serial supported for now)
-			Format: <serial_device>[,baud]
+			Requires a tty driver that supports console polling,
+			or a supported polling keyboard driver (non-usb).
+			Serial only format: <serial_device>[,baud]
+			keyboard only format: kbd
+			keyboard and serial format: kbd,<serial_device>[,baud]
 
 	kmac=		[MIPS] korina ethernet MAC address.
 			Configure the RouterBoard 532 series on-chip