diff --git a/xCAT-client/pods/man1/chdef.1.pod b/xCAT-client/pods/man1/chdef.1.pod
index d227cc28b..fd4cecf75 100644
--- a/xCAT-client/pods/man1/chdef.1.pod
+++ b/xCAT-client/pods/man1/chdef.1.pod
@@ -108,6 +108,12 @@ To add "node01" to the "memberslist" attribute of a group definition called "Lin
 
  chdef -p -t group -o LinuxNodes memberlist="node01"
 
+=item 7.
+
+To update a set of definitions based on information contained in the stanza file mystanzafile.
+
+ cat mystanzafile | chdef -z
+
 =back
 
 
@@ -126,4 +132,4 @@ This command is part of the xCAT software product.
 
 =head1 SEE ALSO
 
-See the mkdef(1), lsdef(1), rmdef(1), and xcatstanzafile(5) commands.
\ No newline at end of file
+See the mkdef(1), lsdef(1), rmdef(1), and xcatstanzafile(5) commands.