diff --git a/perl-xCAT/xCAT/Schema.pm b/perl-xCAT/xCAT/Schema.pm
index 7770e9971..3a0fd505c 100755
--- a/perl-xCAT/xCAT/Schema.pm
+++ b/perl-xCAT/xCAT/Schema.pm
@@ -728,7 +728,7 @@ osimage => {
   description => 'OS Image Description',
   provmethod => 'The provisioning method for node deployment. The valid values are install, netboot,statelite,boottarget,dualboot,sysclone. If boottarget is set, you must set linuximage.boottarget to the name of the boottarget definition. It is not used by AIX.',
   rootfstype => 'The filesystem type for the rootfs is used when the provmethod is statelite. The valid values are nfs or ramdisk. The default value is nfs',
-  osdistroname => 'The name of the OS distro definition.  This attribute can be used to specify which OS distro to use, instead of using the osname,osvers,and osarch attributes.',
+  osdistroname => 'The name of the OS distro definition.  This attribute can be used to specify which OS distro to use, instead of using the osname,osvers,and osarch attributes. For *kit commands,  the attribute will be used to read the osdistro table for the osname, osvers, and osarch attributes. If defined, the osname, osvers, and osarch attributes defined in the osimage table will be ignored.',
   osupdatename => 'A comma-separated list of OS distro updates to apply to this osimage.',
   cfmdir => 'CFM directory name for PCM. Set to /install/osimages/<osimage name>/cfmdir by PCM. ',
   profile => 'The node usage category. For example compute, service.',