diff --git a/perl-xCAT/xCAT/Schema.pm b/perl-xCAT/xCAT/Schema.pm
index 843c4156a..fd3456f9e 100644
--- a/perl-xCAT/xCAT/Schema.pm
+++ b/perl-xCAT/xCAT/Schema.pm
@@ -788,6 +788,7 @@ nimimage  => {
   installp_bundle => 'One or more comma separated NIM installp_bundle resources.',
   mksysb => 'The name of a NIM mksysb resource.',
   shared_root => 'A shared_root resource represents a directory that can be used as a / (root) directory by one or more diskless clients.',
+  image_data  => 'The name of a NIM image_data resource.',
   comments => 'Any user-provided notes.',
   disable => "Set to 'yes' or '1' to comment out this row.",
  },
@@ -1781,6 +1782,11 @@ push(@{$defspec{node}->{'attrs'}}, @nodeattrs);
                  tabentry => 'nimimage.resolv_conf',
                  access_tabentry => 'nimimage.imagename=attr:imagename',
                  },
+ {attr_name => 'image_data',
+				only_if => 'imagetype=NIM',
+				tabentry => 'nimimage.image_data',
+				access_tabentry => 'nimimage.imagename=attr:imagename',
+				},
  {attr_name => 'tmp',
                  only_if => 'imagetype=NIM',
                  tabentry => 'nimimage.tmp',