diff --git a/perl-xCAT/xCAT/Schema.pm b/perl-xCAT/xCAT/Schema.pm
index f4f7222c8..9906f5ef2 100644
--- a/perl-xCAT/xCAT/Schema.pm
+++ b/perl-xCAT/xCAT/Schema.pm
@@ -697,7 +697,7 @@ linuximage  => {
   template => 'The fully qualified name of the template file that is used to create the kick start file for diskful installation.',
   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.   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.',
+  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. ',
   otherpkglist => 'The fully qualified name of the file that stores non-distro package lists that will be included in the image.',
   otherpkgdir => 'The base directory where the non-distro packages are stored.',