Docker run [COMMAND] seems to be required

I am having an issue with Docker version 1.7.1 where I get an error when I do not specify a command argument to a docker run.

If I don’t specify a command at the end of the docker run, I get

Error response from daemon: No command specified

This appears to be a bug in docker since the syntax (–help) for docker run shows “[COMMAND]” in brackets to indicate it’s optional.

Any help?

I’ve verified the same behavior with
Docker version 1.8.1, build d12ea79