diff --git a/perl-xCAT/xCAT/Schema.pm b/perl-xCAT/xCAT/Schema.pm
index 67978ed52..5800073a2 100644
--- a/perl-xCAT/xCAT/Schema.pm
+++ b/perl-xCAT/xCAT/Schema.pm
@@ -610,7 +610,7 @@ osimage => {
     table_desc => 'Basic information about an operating system image that can be used to deploy cluster nodes.',
  descriptions => {
   imagename => 'The name of this xCAT OS image definition.',
-  groups => 'A comma-delimited list of groups this image is a member of.  Group names are arbitrary.',
+  groups => 'A comma-delimited list of image groups of which this image is a member.  Image groups can be used in the litefile and litetree table instead of a single image name. Group names are arbitrary.',
   imagetype => 'The type of operating system image this definition represents (linux,AIX).',
   provmethod => 'The provisioning method for node deployment. The valid values are install, netboot or statelite. 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',