Emphasize the client container requirement in Readme.

README.md

@@ -2,7 +2,7 @@
 
 # Quobyte volume plug-in for Docker
 
-This plugin allows you to use [Quobyte](https://www.quobyte.com) with Docker. The plugin is intended to run without installing the Quobyte client on the host system (e.g. for Rancher/CoreOS) but by using a Quobyte client run in a Docker container. For more information on how to set up a Quobyte Client Docker container look at [docs/coreos.md](docs/coreos.md) or the Quobyte manual (Integration -> Quobyte and Container Infrastructures -> Quobyte Containers - Deep Dive -> Running a Quobyte Client inside a Container).
+This plugin allows you to use [Quobyte](https://www.quobyte.com) with Docker. The plugin is intended to run without installing the Quobyte client on the host system (e.g. for Rancher/CoreOS) but by using a Quobyte client run in a Docker container.
 
 ## Tested
 
@@ -15,6 +15,12 @@ CoreOS 1097.0.0 |     1.11.2
 
 ## Setup
 
+### Prerequisite: Quobyte client mount
+
+As described previously a Quobyte multi volume mount has to be available on the host the plugin is intended to run upon. For this setup we recommend running a dockerized Quobyte client. For more information on how to set up a Quobyte Client Docker container look at the example in [docs/coreos.md](docs/coreos.md) or the Quobyte manual (Integration -> Quobyte and Container Infrastructures -> Quobyte Containers - Deep Dive -> Running a Quobyte Client inside a Container).
+
+Using a locally installed client works fine, too, if this type of installation is preferred.
+
 ### Binary
 
 Download the binary and the systemd files from the [releases](https://github.com/quobyte/docker-volume/releases) page. To download version `1.1` of this plugin run the following step: