README.md in kitchen-docker-2.3.0 vs README.md in kitchen-docker-2.4.0

@@ -92,10 +92,14 @@
 
 ```yaml
   socket: tcp://docker.example.com:4242
 ```
 
-If you use [Boot2Docker](https://github.com/boot2docker/boot2docker), set your `DOCKER_HOST` environment variable properly (e.g. `export DOCKER_HOST=tcp://192.168.59.103:2375`) or you have to use the following:
+If you use [Boot2Docker](https://github.com/boot2docker/boot2docker)
+or [docker-machine](https://docs.docker.com/machine/get-started/) set
+your `DOCKER_HOST` environment variable properly with `export
+DOCKER_HOST=tcp://192.168.59.103:2375` or `eval "$(docker-machine env
+$MACHINE)"` then use the following:
 
 ```yaml
 socket: tcp://192.168.59.103:2375
 ```