Update _port-reqs.mdx

Author: paigecalvert

docs/partials/embedded-cluster/_port-reqs.mdx

@@ -32,10 +32,12 @@ For single-node installations, ensure that there are no other processes using th
 
 The KOTS Admin Console requires that port 30000/TCP is open and available. Create a firewall opening for port 30000/TCP so that the Admin Console can be accessed by the end user.
 
+Additionally, port 30000 must be accessible by nodes joining the cluster.
+
 If port 30000 is occupied, you can select a different port for the Admin Console during installation. For more information, see [Embedded Cluster Install Command Options](/reference/embedded-cluster-install).
 
 #### LAM Port (Air Gap Only)
 
 In addition to the ports above, air gap installations also require that port 50000/TCP is open and available for the Local Artifact Mirror (LAM).
 
-If port 50000 is occupied, you can select a different port for the LAM during installation. For more information, see [Embedded Cluster Install Command Options](/reference/embedded-cluster-install).
+If port 50000 is occupied, you can select a different port for the LAM during installation. For more information, see [Embedded Cluster Install Command Options](/reference/embedded-cluster-install).