diff --git a/xCAT-client/pods/man1/updatenode.1.pod b/xCAT-client/pods/man1/updatenode.1.pod
index 53fcf2f44..1a02b68fd 100644
--- a/xCAT-client/pods/man1/updatenode.1.pod
+++ b/xCAT-client/pods/man1/updatenode.1.pod
@@ -344,7 +344,7 @@ Display usage message.
 =item B<-k|--security>
 
 Update the ssh keys and host keys for the service nodes and compute nodes;
-Update the ca and credentials to the service nodes.
+Update the ca and credentials to the service nodes. Never run this command to the Management Node it will take down the xcatd. 
 
 =item B<-P|--scripts>