···13131414### the engine
15151616-At present, the only supported backend is Docker. Spindle executes each step in
1717-the pipeline in a fresh container, with state persisted across steps within the
1818-`/tangled/workspace` directory.
1616+At present, the only supported backend is Docker (and Podman, if Docker
1717+compatibility is enabled, so that `/run/docker.sock` is created). Spindle
1818+executes each step in the pipeline in a fresh container, with state persisted
1919+across steps within the `/tangled/workspace` directory.
19202021The base image for the container is constructed on the fly using
2122[Nixery](https://nixery.dev), which is handy for caching layers for frequently