diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index e9261e9..c357a31 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -872,6 +872,12 @@
 			       If specified, z/VM IUCV HVC accepts connections
 			       from listed z/VM user IDs only.
 
+	keep_bootcon	[KNL]
+			Do not unregister boot console at start. This is only
+			useful for debugging when something happens in the window
+			between unregistering the boot console and initializing
+			the real console.
+
 	i2c_bus=	[HW] Override the default board specific I2C bus speed
 			     or register an additional I2C bus that is not
 			     registered from board initialization code.