diff --git a/perl-xCAT/xCAT/Schema.pm b/perl-xCAT/xCAT/Schema.pm
index 6ab3247dc..0a1794e7c 100644
--- a/perl-xCAT/xCAT/Schema.pm
+++ b/perl-xCAT/xCAT/Schema.pm
@@ -133,11 +133,12 @@ ipmi => {
 iscsi => {
     cols => [qw(node server target file userid passwd kernel kcmdline initrd comments disable)],
     keys => [qw(node)],
-    table_desc => 'Contains settings that control how to boot a node from an iSCSI disk.',
+    table_desc => 'Contains settings that control how to boot a node from an iSCSI target',
  descriptions => {
   node => 'The node name or group name.',
   server => 'The server containing the iscsi boot device for this node.',
   target => 'The iscsi disk used for the boot device for this node.  Filled in by xCAT.',
+  lun => 'LUN of boot device.  Per RFC-4173, this is presumed to be 0 if unset.  tgtd often requires this to be 1',
   file => 'The path on the server of the OS image the node should boot from.',
   userid => 'The userid of the iscsi server containing the boot device for this node.',
   passwd => 'The password for the iscsi server containing the boot device for this node.',