Add link to dev containers install

README.md

@@ -50,7 +50,7 @@ Once you have one of these up and running, see the [Getting everything running](
 
 #### Using VS Code
 
-This project comes with a [devcontainer.json configuration](https://code.visualstudio.com/docs/devcontainers/containers) which can be used with VS Code. This takes care of all the `docker-compose` stuff in the background so you don't have to worry about it. When you open the project in VS Code, it should prompt you to start it in a dev container. Once the dev container starts, you can open a new terminal window in VS Code to run commands. See [the commands below](#getting-everything-running) for how to get everything started.
+This project comes with a [devcontainer.json configuration](https://code.visualstudio.com/docs/devcontainers/containers) which can be used with VS Code. This takes care of all the `docker-compose` stuff in the background so you don't have to worry about it. When you open the project in VS Code, it should prompt you to start it in a dev container (assuming [you've installed Docker and the Dev Containers extension](https://code.visualstudio.com/docs/devcontainers/containers#_installation)). Once the dev container starts, you can open a new terminal window in VS Code to run commands. See [the commands below](#getting-everything-running) for how to get everything started.
 
 #### Using docker-compose directly