README.md in kitchen-docker-1.1.0.beta vs README.md in kitchen-docker-1.2.0

@@ -30,12 +30,14 @@
 ```
 
 ## Default Configuration
 
 This driver can determine an image and platform type for a select number of
-platforms. Currently, the following platform names are supported:
+platforms.
 
+Examples:
+
 ```
 ---
 platforms:
 - name: ubuntu-12.04
 - name: centos-6.4
@@ -56,10 +58,26 @@
     platform: centos
 ```
 
 ## Configuration
 
+### binary
+
+The Docker binary to use.
+
+The default value is `docker`.
+
+Examples:
+
+```
+  binary: docker.io
+```
+
+```
+  binary: /opt/docker
+```
+
 ### socket
 
 The Docker daemon socket to use. By default, Docker will listen on
 `unix:///var/run/docker.sock`, and no configuration here is required. If
 Docker is binding to another host/port or Unix socket, you will need to set
@@ -79,26 +97,23 @@
 ### image
 
 The Docker image to use as the base for the suite containers. You can find
 images using the [Docker Index][docker_index].
 
-The default will be determined by the Platform name, if a default exists
-(see the Default Configuration section for more details). If a default
-cannot be computed, then the default value is `base`, an official Ubuntu
-[image][docker_default_image].
+The default will be computed, using the platform name (see the Default
+Configuration section for more details).
 
 ### platform
 
 The platform of the chosen image. This is used to properly bootstrap the
 suite container for Test Kitchen. Kitchen Docker currently supports:
 
 * `debian` or `ubuntu`
 * `rhel` or `centos`
 
-The default will be determined by the Platform name, if a default exists
-(see the Default Configuration section for more details). If a default
-cannot be computed, then the default value is `ubuntu`.
+The default will be computed, using the platform name (see the Default
+Configuration section for more details).
 
 ### require\_chef\_omnibus
 
 Determines whether or not a Chef [Omnibus package][chef_omnibus_dl] will be
 installed. There are several different behaviors available:
@@ -248,9 +263,19 @@
 
 Examples:
 
 ```
   privileged: true
+```
+
+## dockerfile
+
+Use a custom Dockerfile, instead of having Kitchen-Docker build one for you.
+
+Examples:
+
+```
+  dockerfile: test/Dockerfile
 ```
 
 ## Development
 
 * Source hosted at [GitHub][repo]