Update README.md

README.md

@@ -12,10 +12,8 @@ Currently, the project adds an `INCLUDE+` Dockerfile directive that allows you t
 
 ## Getting started
 
-First, you need to make sure you are running a compatible version of Docker:
+- First, you need to make sure you are running a compatible version of Docker: you need at least Docker 18.09. If you are using an older version, you are out of luck. Sorry!
-- if you are using Docker 20.10+, you're all set!
+- Export the following environment variables to enable Buildkit: `DOCKER_BUILDKIT=1` and `COMPOSE_DOCKER_CLI_BUILD=1` (this might not be necessary for newer installations of Docker)
-- if you are using Docker 18.09+, then you need to export the following environment variable: `DOCKER_BUILDKIT=1`
-- if you are using an older version of Docker, you are out of luck. Sorry!
 
 Once your Docker is set, you just need to add the following line as your first line in your Dockerfile:
 
@@ -79,4 +77,4 @@ $ cargo build
 
 ```bash
 $ docker build -f dockerfile-plus/Dockerfile .
-```
+```