OSDOCS-2314: OSUS Operator update info

Author: skopacz1

updating/updating_a_cluster/updating_disconnected_cluster/disconnected-update-osus.adoc

@@ -135,6 +135,13 @@ The release image signature config map allows the Cluster Version Operator (CVO)
 ====
 * The current release and update target release images are mirrored to a locally accessible registry.
 * A recent graph data container image has been mirrored to your local registry.
+* A recent version of the OpenShift Update Service Operator is installed.
++
+[NOTE]
+====
+If you have not recently installed or updated the OpenShift Update Service Operator, there might be a more recent version available.
+See xref:../../../operators/admin/olm-restricted-networks.adoc#olm-restricted-networks[Using Operator Lifecycle Manager on restricted networks] for more information about how to update your OLM catalog in a disconnected environment.
+====
 
 After you configure your cluster to use the locally-installed OpenShift Update Service and local mirror registry, you can use any of the following update methods: