diff --git a/perl-xCAT/xCAT/Schema.pm b/perl-xCAT/xCAT/Schema.pm
index 6a6de6683..86864f234 100644
--- a/perl-xCAT/xCAT/Schema.pm
+++ b/perl-xCAT/xCAT/Schema.pm
@@ -332,7 +332,7 @@ noderes => {
     table_desc => 'Resources and settings to use when installing nodes.',
  descriptions => {
   node => 'The node name or group name.',
-  servicenode => 'The node that provides most services for this node (as known by the management node).',
+  servicenode => 'A comma separated list of nodes that provides most services for this node (as known by the management node). The service node to be used will be chosen from the list, starting with the first node on the list. If that service node is not accessable, then the next service node will be chosen from the list, etc.',
   netboot => 'The type of network booting supported by this node.  Valid values:  pxe, yaboot.',
   tftpserver => 'The TFTP server for this node (as known by this node).',
   nfsserver => 'The NFS server for this node (as known by this node).',