The volume plugins look very interesting for our use case, but I can't find any documentation about how to actually write a plugin? Do I have to reverse enginee

The volume plugins look very interesting for our use case, but I can't find any documentation about how to actually write a plugin? Do I have to reverse engineer it from the Flocker example provided? Edit: Nevermind, I found it (https://github.com/docker/docker/blob/master/experimental/plugin_api.md https://github.com/docker/docker/blob/master/experimental/pl...)! Three clicks in, through various blog articles with lots of other links. Maybe consider making this more obvious?