diff --git a/xCAT-client/pods/man1/chdef.1.pod b/xCAT-client/pods/man1/chdef.1.pod
index 9ce41d3fa..273ff6a0a 100644
--- a/xCAT-client/pods/man1/chdef.1.pod
+++ b/xCAT-client/pods/man1/chdef.1.pod
@@ -11,7 +11,7 @@ B<chdef> [B<-t> I<object-types>] [B<-o> I<object-names>] [B<-n> I<new-name>] [I<
 B<chdef> [B<-V>|B<--verbose>] [B<-t> I<object-types>] [B<-o> I<object-names>]
 [B<-d>|B<--dynamic>] [B<-p>|B<--plus>] [B<-m>|B<--minus>] [B<-z>|B<--stanza>]
 [[B<-w> I<attr>==I<val>] [B<-w> I<attr>=~I<val>] ...] [I<noderange>] [I<attr>=I<val> [I<attr>=I<val...>]]
-      [B<-u> B<provmethod>=<I<install>|I<netboot>|I<statelite>> B<profile>=<xxx> [I<attr>=I<value>]]
+      [B<-u> [I<provmethod>=<I<install>|I<netboot>|I<statelite>>] [I<profile>=<xxx>] [I<osvers>=I<value>] [I<osarch>=I<value>]]
 
 =head1 DESCRIPTION
 
@@ -83,9 +83,9 @@ Indicates that the file being piped to the command is in stanza format. See the
 
 =item B<-u>
 
-This option only works for objtype B<osimage>.
+Fill in the attributes such as template file, pkglist file and otherpkglist file of osimage object based on the specified parameters. It will search "/install/custom/" directory first, and then "/opt/xcat/share/".
 
-Updating the osimage attribute automatically. If osvers or osarch is not specified, the corresponding value of the management node will be used.
+Note: this option only works for objtype B<osimage>.
 
 =back
 
diff --git a/xCAT-client/pods/man1/mkdef.1.pod b/xCAT-client/pods/man1/mkdef.1.pod
index d1f005e70..fb1f34d0f 100644
--- a/xCAT-client/pods/man1/mkdef.1.pod
+++ b/xCAT-client/pods/man1/mkdef.1.pod
@@ -9,7 +9,7 @@ B<mkdef> [B<-h>|B<--help>] [B<-t> I<object-types>]
 B<mkdef> [B<-V>|B<--verbose>] [B<-t> I<object-types>] [B<-o> I<object-names>]
 [B<-z>|B<--stanza>] [B<-d>|B<--dynamic>] [B<-f>|B<--force>]
 [[B<-w> I<attr>==I<val>] [B<-w> I<attr>=~I<val>] ...] [I<noderange>] [I<attr>=I<val> [I<attr>=I<val...>]]
-      [B<-u> B<provmethod>=<I<install>|I<netboot>|I<statelite>> B<profile>=<xxx> [I<attr>=I<value>]]
+      [B<-u> B<provmethod>=<I<install>|I<netboot>|I<statelite>> B<profile>=<xxx> [I<osvers>=I<value>] [I<osarch>=I<value>]]
 
 
 =head1 DESCRIPTION
@@ -73,9 +73,10 @@ Indicates that the file being piped to the command is in stanza format.  See the
 
 =item B<-u>
 
-This option only works for objtype B<osimage>.
+Fill in the attributes such as template file, pkglist file and otherpkglist file of osimage object based on the specified parameters. It will search "/install/custom/" directory first, and then "/opt/xcat/share/".
+The I<provmethod> and I<profile> must be specified. If I<osvers> or I<osarch> is not specified, the corresponding value of the management node will be used.
 
-Fill in the osimage attribute automatically when define osimage. The I<provmethod> and I<profile> must be specified. If osvers or osarch is not specified, the corresponding value of the management node will be used.
+Note: this option only works for objtype B<osimage>.
 
 =back
 
diff --git a/xCAT-server/lib/xcat/plugins/DBobjectdefs.pm b/xCAT-server/lib/xcat/plugins/DBobjectdefs.pm
index e0b0a9b09..0c4b2a451 100755
--- a/xCAT-server/lib/xcat/plugins/DBobjectdefs.pm
+++ b/xCAT-server/lib/xcat/plugins/DBobjectdefs.pm
@@ -4024,7 +4024,7 @@ sub defmk_usage
     $rsp->{data}->[4] =
       "      [-f | --force] [noderange] [attr=val [attr=val...]]";
     $rsp->{data}->[5] = 
-      "      [-u provmethod=<install|netboot|statelite> profile=<xxx> [attr=value]]\n";
+      "      [-u provmethod=<install|netboot|statelite> profile=<xxx> [osvers=value] [osarch=value]]\n";
     $rsp->{data}->[6] =
       "\nThe following data object types are supported by xCAT.\n";
     my $n = 7;
@@ -4074,7 +4074,7 @@ sub defch_usage
     $rsp->{data}->[5] =
       "    [-w attr==val [-w attr=~val] ... ] [noderange] [attr=val [attr=val...]]\n";
     $rsp->{data}->[6] = 
-      "    [-u [provmethod=<install|netboot|statelite>]|[profile=<xxx>]|[attr=value]]";
+      "    [-u [provmethod=<install|netboot|statelite>]|[profile=<xxx>]|[osvers=value]|[osarch=value]]";
     $rsp->{data}->[7] =
       "\nThe following data object types are supported by xCAT.\n";
     my $n = 8;