Add additional cluster comment per feedback from field.

Author: wmgries

articles/storage/files/storage-sync-files-deployment-guide.md

@@ -79,7 +79,7 @@ The Azure File Sync agent is a downloadable package that enables Windows Server
 You can download the agent from the [Microsoft Download Center](https://go.microsoft.com/fwlink/?linkid=858257). When the download is finished, double-click the MSI package to start the Azure File Sync agent installation.
 
 > [!Important]  
-> If you intend to use Azure File Sync with a Failover Cluster, the Azure File Sync agent must be installed on every node in the cluster.
+> If you intend to use Azure File Sync with a Failover Cluster, the Azure File Sync agent must be installed on every node in the cluster. Each node in the cluster must registered to work with Azure File Sync.
 
 We recommend that you do the following:
 - Leave the default installation path (C:\Program Files\Azure\StorageSyncAgent), to simplify troubleshooting and server maintenance.
@@ -90,6 +90,9 @@ When the Azure File Sync agent installation is finished, the Server Registration
 # [PowerShell](#tab/powershell)
 Execute the following PowerShell code to download the appropriate version of the Azure File Sync agent for your OS and install it on your system.
 
+> [!Important]  
+> If you intend to use Azure File Sync with a Failover Cluster, the Azure File Sync agent must be installed on every node in the cluster. Each node in the cluster must registered to work with Azure File Sync.
+
 ```PowerShell
 # Gather the OS version
 $osver = [System.Environment]::OSVersion.Version