diff --git a/Documentation/nfsroot.txt b/Documentation/nfsroot.txt
index 16a7cae2721dada82c9e1d9267b48c9f90b9802d..9b956a96936204c19545a3871b42b949a48a842a 100644
--- a/Documentation/nfsroot.txt
+++ b/Documentation/nfsroot.txt
@@ -92,8 +92,14 @@ ip=<client-ip>:<server-ip>:<gw-ip>:<netmask>:<hostname>:<device>:<autoconf>
   autoconfiguration.
 
   The <autoconf> parameter can appear alone as the value to the `ip'
-  parameter (without all the ':' characters before) in which case auto-
-  configuration is used.
+  parameter (without all the ':' characters before).  If the value is
+  "ip=off" or "ip=none", no autoconfiguration will take place, otherwise
+  autoconfiguration will take place.  The most common way to use this
+  is "ip=dhcp".
+
+  Note that "ip=off" is not the same thing as "ip=::::::off", because in
+  the latter autoconfiguration will take place if any of DHCP, BOOTP or RARP
+  are compiled in the kernel.
 
   <client-ip>	IP address of the client.
 
@@ -142,7 +148,7 @@ ip=<client-ip>:<server-ip>:<gw-ip>:<netmask>:<hostname>:<device>:<autoconf>
 		into the kernel will be used, regardless of the value of
 		this option.
 
-                  off or none: don't use autoconfiguration (default)
+                  off or none: don't use autoconfiguration
 		  on or any:   use any protocol available in the kernel
 		  dhcp:        use DHCP
 		  bootp:       use BOOTP
diff --git a/net/ipv4/ipconfig.c b/net/ipv4/ipconfig.c
index c5c107a01823097120b21698ed24021647abb24e..96400b0bd08a9bca5237f5c9938143ec697cdb51 100644
--- a/net/ipv4/ipconfig.c
+++ b/net/ipv4/ipconfig.c
@@ -1396,25 +1396,7 @@ late_initcall(ip_auto_config);
 
 /*
  *  Decode any IP configuration options in the "ip=" or "nfsaddrs=" kernel
- *  command line parameter. It consists of option fields separated by colons in
- *  the following order:
- *
- *  <client-ip>:<server-ip>:<gw-ip>:<netmask>:<host name>:<device>:<PROTO>
- *
- *  Any of the fields can be empty which means to use a default value:
- *	<client-ip>	- address given by BOOTP or RARP
- *	<server-ip>	- address of host returning BOOTP or RARP packet
- *	<gw-ip>		- none, or the address returned by BOOTP
- *	<netmask>	- automatically determined from <client-ip>, or the
- *			  one returned by BOOTP
- *	<host name>	- <client-ip> in ASCII notation, or the name returned
- *			  by BOOTP
- *	<device>	- use all available devices
- *	<PROTO>:
- *	   off|none	    - don't do autoconfig at all (DEFAULT)
- *	   on|any           - use any configured protocol
- *	   dhcp|bootp|rarp  - use only the specified protocol
- *	   both             - use both BOOTP and RARP (not DHCP)
+ *  command line parameter.  See Documentation/nfsroot.txt.
  */
 static int __init ic_proto_name(char *name)
 {