Updated readme with permissions note

README.md

@@ -3,11 +3,10 @@
     VMX makes computer vision easy.  Docker makes bundling complex
     applications easy.  The vmx-docker-manager lets you run the VMX
     Object Detection server on a Linux computer, or a (Mac/Windows)
-    machine via boot2docker. [We also provide a non-docker native Mac
-    OS X build of VMX].
+    machine via boot2docker. 
 
 ##Requirements
-    64 bit Linux and Docker >= 1.2
+    64 bit Linux and Docker >= 1.2, root permissions to run Docker
     boot2docker for Mac or Windows
 
 ##Instructions
@@ -23,14 +22,14 @@ Or download the shell script directly: https://raw.githubusercontent.com/VISIONA
     Commands:
         start PORT: Start vmx on localhost:PORT
         stop:       Stop vmx
-        enter:      Shell access to docker
+        enter:      Shell access to a Docker container for inspecting volumes
         init :      Download and start the containers that have the pre-reqs, mcr, etc.
                     (This is done automatically the first time you start vmx)
         update TAG: Update your vmx (will stop vmx first). TAG must be
-                    "latest" or "dev", defaults to "latest"
-        backup BACKUP: Backup your vmx data (models, session logs,
-                       config file) to folder BACKUP
-        
+                    "latest" or "dev", defaults to "latest" when TAG is empty
+        backup BACKUP: Backup your vmx data (models and config file) to folder BACKUP
+        restore BACKUP: Restore from a backup        
+
 ##Example:
  Run vmx on port 3000
 
@@ -61,7 +60,17 @@ or
     $  ./vmx update dev
 
 
+##Permissions
+
+vmx-docker-manager uses Docker which requires permission to run as root, or the
+user to be added to the `docker` group.
+
+To make sure Docker is installed and running correctly on your machine, you can first
+try a simple Docker command such as:
 
+```
+docker run -t -i --rm ubuntu echo "Docker runs"
+```
 
 ##Explanation
 
@@ -73,9 +82,13 @@ general, VMX requires a few files/folder to be available:
    - Local Model storage
  - Certain open source libraries
 
-The VMX Docker manager is a set of sane defaults and configurations that store user data (session and models) in seperate volumes at /vmx/sessions and /vmx/models; and loads the binaries into /vmx/build.  Those mount points, along with the matlab MCR dependency are run within the context of an Ubuntu 14.04 with the required libraries.
+The VMX Docker manager is a set of sane defaults and configurations
+that store user data (session and models) in seperate volumes at
+/vmx/sessions and /vmx/models; and loads the binaries into /vmx/build.
+Those mount points, along with the matlab MCR dependency are run
+within the context of an Ubuntu 14.04 with the required libraries.
 
-The dockerfiles that build the referenced docker images can be found here:
+The Dockerfiles that build the referenced Docker images can be found here:
 
 - https://github.com/VISIONAI/docker-mcr-2014a
 - https://github.com/VISIONAI/docker-vmx-userdata