diff --git a/xCAT-client/pods/man8/makeknownhosts.8.pod b/xCAT-client/pods/man8/makeknownhosts.8.pod
index 67e91cd48..649cd6830 100644
--- a/xCAT-client/pods/man8/makeknownhosts.8.pod
+++ b/xCAT-client/pods/man8/makeknownhosts.8.pod
@@ -4,16 +4,21 @@ B<makeknownhosts> - Make a known_hosts file under $ROOTHOME/.ssh for input noder
 
 =head1 SYNOPSIS
 
-B<makeknownhosts> [I<noderange>]
+B<makeknownhosts> I<noderange>
 
 B<makeknownhosts> {B<-h>|B<--help>}
 
 =head1 DESCRIPTION
 
-B<makeknownhosts> builds a known_hosts file in the $ROOTHOME/.ssh directory for all nodes from the input noderange. The known_hosts file is built from the 
-shared ssh host key that xCAT distributes to the nodes.
-To build the key for a node, you are only required to have the node in the database and name resolution working for the node. You do not have to be able to access the node. 
-Having this file will avoid the ssh warning when nodes are automatically added to the known_hosts file.   The file should be distributed using xdcp to all the nodes, if you want node to node communication not to display the warning. 
+B<makeknownhosts> Replaces in the known_hosts file in the $ROOTHOME/.ssh directory, the enties for the nodes from the noderange input to the command.
+The known_hosts file entry is built from the shared ssh host key that xCAT distributes to the installed nodes.
+
+HMCs, AMM, switches, etc., where xCAT does not distribute the shared ssh host key, should not be put in the noderange.
+
+To build the known_hosts entry for a node, you are only required to have the node in the database, and name resolution working for the node. You do not have to be able to access the node. 
+
+Having this file with correct entries, will avoid the ssh warning when nodes are automatically added to the known_hosts file.
+The file should be distributed using xdcp to all the nodes, if you want node to node communication not to display the warning. 
 
 =head1 OPTIONS
 
@@ -29,6 +34,10 @@ Having this file will avoid the ssh warning when nodes are automatically added t
 
 makeknownhosts compute
 
+=item *
+
+makeknownhosts lpars,service 
+
 =back