diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index 65de5ba7b74..d29b6d926a4 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -370,8 +370,6 @@ and is between 256 and 4096 characters. It is defined in the file
 			configured.  Potentially dangerous and should only be
 			used if you are entirely sure of the consequences.
 
-	chandev=	[HW,NET] Generic channel device initialisation
-
 	checkreqprot	[SELINUX] Set initial checkreqprot flag value.
 			Format: { "0" | "1" }
 			See security/selinux/Kconfig help text.
@@ -382,6 +380,12 @@ and is between 256 and 4096 characters. It is defined in the file
 			Value can be changed at runtime via
 				/selinux/checkreqprot.
 
+	cio_ignore=	[S390]
+			See Documentation/s390/CommonIO for details.
+
+	cio_msg=	[S390]
+			See Documentation/s390/CommonIO for details.
+
 	clock=		[BUGS=X86-32, HW] gettimeofday clocksource override.
 			[Deprecated]
 			Forces specified clocksource (if available) to be used