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Update README.md

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Kevin Doveton 2017-01-27 13:24:24 +10:30 committed by GitHub
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@ -15,7 +15,7 @@ Then start any containers you want proxied with an env var `VIRTUAL_HOST=subdoma
$ docker run -e VIRTUAL_HOST=foo.bar.com ...
The containers being proxied must [expose](https://docs.docker.com/engine/reference/builder/#expose) the port to be proxied, either by using the `EXPOSE` directive in their `Dockerfile` or by using the `--expose` flag to `docker run` or `docker create`.
The containers being proxied must [expose](https://docs.docker.com/engine/reference/run/#expose-incoming-ports) the port to be proxied, either by using the `EXPOSE` directive in their `Dockerfile` or by using the `--expose` flag to `docker run` or `docker create`.
Provided your DNS is setup to forward foo.bar.com to the a host running nginx-proxy, the request will be routed to a container with the VIRTUAL_HOST env var set.