message: Note that docker service must be running in README.
diff: @@ -50,7 +50,8 @@ There may be other dependencies that have not been documented.
  ### Getting started
  -Make sure you have docker-compose and are able to download ~10GB data on the first run.
  +Make sure you have docker-compose and are able to download ~10GB data on the first run. Also ensure that
  +docker is installed and the service is running.
  ```sh
  git clone https://github.com/rust-lang/docs.rs.git docs.rs
  