[ACI] Clarified file share intro

Author: dlepow

articles/container-instances/container-instances-volume-azure-files.md

@@ -14,10 +14,11 @@ ms.custom: mvc
 
 # Mount an Azure file share in Azure Container Instances
 
-By default, Azure Container Instances are stateless. If the container crashes or stops, all of its state is lost. To persist state beyond the lifetime of the container, you must mount a volume from an external store. This article shows how to mount an Azure file share created with [Azure Files](../storage/files/storage-files-introduction.md) for use with Azure Container Instances. Azure Files offers fully managed file shares in the cloud that are accessible via the industry standard Server Message Block (SMB) protocol. Using an Azure file share with Azure Container Instances provides file-sharing features similar to using an Azure file share with Azure virtual machines.
+By default, Azure Container Instances are stateless. If the container crashes or stops, all of its state is lost. To persist state beyond the lifetime of the container, you must mount a volume from an external store. As shown in this article, Azure Container Instances can mount an Azure file share created with [Azure Files](../storage/files/storage-files-introduction.md). Azure Files offers fully managed file shares in the cloud that are accessible via the industry standard Server Message Block (SMB) protocol. Using an Azure file share with Azure Container Instances provides file-sharing features similar to using an Azure file share with Azure virtual machines.
 
 > [!NOTE]
 > Mounting an Azure Files share is currently restricted to Linux containers. While we are working to bring all features to Windows containers, you can find current platform differences in the [overview](container-instances-overview.md#linux-and-windows-containers).
+> Mounting an Azure Files share to a container instance is similar to a Docker [bind mount](https://docs.docker.com/storage/bind-mounts/). Be aware that if you mount a share into a directory in the container in which some files or directories exist, these files or directories are obscured by the mount and are not accessible while the container runs.
 
 ## Create an Azure file share