diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
index 4d0f545fb3ec..319dfea30133 100644
--- a/Documentation/admin-guide/kernel-parameters.txt
+++ b/Documentation/admin-guide/kernel-parameters.txt
@@ -24,7 +24,6 @@
 	IP_PNP	IP DHCP, BOOTP, or RARP is enabled.
 	IPV6	IPv6 support is enabled.
 	ISAPNP	ISA PnP code is enabled.
-	ISDN	Appropriate ISDN support is enabled.
 	ISOL	CPU Isolation is enabled.
 	JOY	Appropriate joystick support is enabled.
 	KGDB	Kernel debugger support is enabled.
@@ -2245,9 +2244,6 @@ Kernel parameters
 			syscalls, essentially overriding IA32_EMULATION_DEFAULT_DISABLED at
 			boot time. When false, unconditionally disables IA32 emulation.
 
-	icn=		[HW,ISDN]
-			Format: <io>[,<membase>[,<icn_id>[,<icn_id2>]]]
-
 
 	idle=		[X86,EARLY]
 			Format: idle=poll, idle=halt, idle=nomwait
@@ -5037,8 +5033,6 @@ Kernel parameters
 			the specified number of seconds.  This is to be used if
 			your oopses keep scrolling off the screen.
 
-	pcbit=		[HW,ISDN]
-
 	pci=option[,option...]	[PCI,EARLY] various PCI subsystem options.
 
 				Some options herein operate on a specific device