diff --git a/perl-xCAT/xCAT/Schema.pm b/perl-xCAT/xCAT/Schema.pm
index 9cd3cea60..028cf29dd 100755
--- a/perl-xCAT/xCAT/Schema.pm
+++ b/perl-xCAT/xCAT/Schema.pm
@@ -326,7 +326,7 @@ bootparams => {
       'kernel' => 'The kernel that network boot actions should currently acquire and use.  Note this could be a chained boot loader such as memdisk or a non-linux boot loader',
       'initrd' => 'The initial ramdisk image that network boot actions should use (could be a DOS floppy or hard drive image if using memdisk as kernel)',
       'kcmdline' => 'Arguments to be passed to the kernel',
-      'addkcmdline' => 'User specified one or more parameters to be passed to the kernel. For the kernel options need to be persistent after installation, specify them with prefix "P::"',
+      'addkcmdline' => 'User specified one or more parameters to be passed to the kernel. For the kernel options need to be persistent after installation, specify them with prefix "R::"',
       'dhcpstatements' => 'xCAT manipulated custom dhcp statements (not intended for user manipulation)',
       'adddhcpstatements' => 'Custom dhcp statements for administrator use (not implemneted yet)',
      comments => 'Any user-written notes.',
@@ -754,7 +754,7 @@ linuximage  => {
   imagename => 'The name of this xCAT OS image definition.',
   template => 'The fully qualified name of the template file that will be used to create the OS installer configuration file for stateful installations (e.g.  kickstart for RedHat, autoyast for SLES).',
   boottarget => 'The name of the boottarget definition.  When this attribute is set, xCAT will use the kernel, initrd and kernel params defined in the boottarget definition instead of the default.',
-   addkcmdline=> 'User specified arguments to be passed to the kernel.  The user arguments are appended to xCAT.s default kernel arguments. For the kernel options need to be persistent after installation, specify them with prefix "P::".  This attribute is ignored if linuximage.boottarget is set.',
+   addkcmdline=> 'User specified arguments to be passed to the kernel.  The user arguments are appended to xCAT.s default kernel arguments. For the kernel options need to be persistent after installation, specify them with prefix "R::".  This attribute is ignored if linuximage.boottarget is set.',
   pkglist => 'The fully qualified name of the file that stores the distro  packages list that will be included in the image. Make sure that if the pkgs in the pkglist have dependency pkgs, the dependency pkgs should be found in one of the pkgdir',
   pkgdir => 'The name of the directory where the distro packages are stored. It could be set multiple paths.The multiple paths must be seperated by ",". The first path in the value of osimage.pkgdir must be the OS base pkg dir path, such as pkgdir=/install/rhels6.2/x86_64,/install/updates . In the os base pkg path, there are default repository data. And in the other pkg path(s), the users should make sure there are repository data. If not, use "createrepo" command to create them. For ubuntu, multiple mirrors can be specified in the pkgdir attribute, the mirrors must be prefixed by the protocol(http/ssh) and delimited with "," between each other.',
   otherpkglist => 'The fully qualified name of the file that stores non-distro package lists that will be included in the image. It could be set multiple paths.The multiple paths must be seperated by ",".',
diff --git a/perl-xCAT/xCAT/Utils.pm b/perl-xCAT/xCAT/Utils.pm
index b71b956a6..3509fe7b4 100644
--- a/perl-xCAT/xCAT/Utils.pm
+++ b/perl-xCAT/xCAT/Utils.pm
@@ -4523,7 +4523,7 @@ sub splitkcmdline{
 
  my @cmdlist=split(/[, ]/,$kcmdline);
  foreach my $cmd (@cmdlist){
-    if($cmd =~ /^P::(.*)$/){
+    if($cmd =~ /^R::(.*)$/){
       $cmdhash{persistent}.="$1 ";
     }else{
       $cmdhash{volatile}.="$cmd ";