--- zzzz-none-000/linux-3.10.107/Documentation/filesystems/nfs/nfsroot.txt	2017-06-27 09:49:32.000000000 +0000
+++ scorpion-7490-727/linux-3.10.107/Documentation/filesystems/nfs/nfsroot.txt	2021-02-04 17:41:59.000000000 +0000
@@ -157,6 +157,9 @@
 		  both:        use both BOOTP and RARP but not DHCP
 		               (old option kept for backwards compatibility)
 
+		if dhcp is used, the client identifier can be used by following
+		format "ip=dhcp,client-id-type,client-id-value"
+
                 Default: any
 
   <dns0-ip>	IP address of first nameserver.