According to the [compose docs] and [compose specification], `compose.yaml` (with the `a`) is the preferred filename. Maybe a bit of nitpicking, but I would prefer to comply with the "standard" in this case. [compose docs]: https://docs.docker.com/compose/intro/compose-application-model/#the-compose-file [compose specification]: https://github.com/compose-spec/compose-spec/blob/c0c3dba71a73260cf9649e05370dcad6fe29e11c/spec.md?plain=1#L170-L172