diff --git a/xCAT-client/pods/man1/chdef.1.pod b/xCAT-client/pods/man1/chdef.1.pod
index 616b30704..97cce3d73 100644
--- a/xCAT-client/pods/man1/chdef.1.pod
+++ b/xCAT-client/pods/man1/chdef.1.pod
@@ -7,7 +7,7 @@ B<chdef> - Change xCAT data object definitions.
 B<chdef> [B<-h>|B<--help>] [B<-t> I<object-types>]
 
 B<chdef> [B<-V>|B<--verbose>] [B<-t> I<object-types>] [B<-o> I<object-names>]
-[B<-p>|B<--plus>] [B<-m>|B<--minus>] [B<-z>|B<--stanza>]
+[B<-d>|B<--dynamic>] [B<-p>|B<--plus>] [B<-m>|B<--minus>] [B<-z>|B<--stanza>]
 [B<-w> I<attr>=I<val>,[I<attr>=I<val...>]] [I<noderange>] [I<attr>=I<val> [I<attr>=I<val...>]]
 
 =head1 DESCRIPTION
@@ -22,6 +22,10 @@ This command is used to change xCAT object definitions which are stored in the x
 
 Specifies one or more "attribute equals value" pairs, separated by spaces. Attr=val pairs must be specified last on the command line. Use the help option to get a list of valid attributes for each object type.
 
+=item B<-d|--dynamic>
+
+Use the dynamic option to change dynamic node groups definition. This option must be used with -w option.
+
 =item B<-h|--help>
 
 Display usage message.
diff --git a/xCAT-client/pods/man1/mkdef.1.pod b/xCAT-client/pods/man1/mkdef.1.pod
index 7b8bb799a..bacae549d 100644
--- a/xCAT-client/pods/man1/mkdef.1.pod
+++ b/xCAT-client/pods/man1/mkdef.1.pod
@@ -7,8 +7,8 @@ B<mkdef> - Use this command to create xCAT data object definitions.
 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<-f>|B<--force>] [B<-w> I<attr>=I<val>,[I<attr>=I<val...>]]
-[I<noderange>] [I<attr>=I<val> [I<attr>=I<val...>]]
+[B<-z>|B<--stanza>] [B<-d>|B<--dynamic>] [B<-f>|B<--force>]
+[B<-w> I<attr>=I<val>,[I<attr>=I<val...>]] [I<noderange>] [I<attr>=I<val> [I<attr>=I<val...>]]
 
 
 =head1 DESCRIPTION
@@ -24,6 +24,10 @@ This command is used to create xCAT object definitions which are stored in the x
 
 Specifies one or more "attribute equals value" pairs, separated by spaces. Attr=val pairs must be specified last on the command line. Use the help option to get a list of valid attributes for each object type.
 
+=item B<-d|--dynamic>
+
+Use the dynamic option to create dynamic node groups. This option must be used with -w option.
+
 =item B<-f|--force>
 
 Use the force option to re-create object definitions. This option removes the old definition before creating the new one.
@@ -132,4 +136,4 @@ This command is part of the xCAT software product.
 
 =head1 SEE ALSO
 
-L<chdef(1)|chdef.1>, L<lsdef(1)|lsdef.1>, L<rmdef(1)|rmdef.1>, L<xcatstanzafile(5)|xcatstanzafile.5>
\ No newline at end of file
+L<chdef(1)|chdef.1>, L<lsdef(1)|lsdef.1>, L<rmdef(1)|rmdef.1>, L<xcatstanzafile(5)|xcatstanzafile.5>