updated readme

Author: Craig

README.md

@@ -2,13 +2,12 @@
 
 Docker container to run a WSGI Python app using
 [Waitress](https://docs.pylonsproject.org/projects/waitress/en/stable/index.html). Images support python 3.6+ and are
-based on the official `python:slim` containers.
+based on the [official python containers](). The `-slim` versions are based on the similarly named python versions.
 
 [Pull from Docker Hub](https://hub.docker.com/r/tecktron/python-waitress/)
 
 [View on GitHub](https://github.com/Tecktron/docker-python-waitress)
 
-
 ## How to use
 
 * You don't need to clone the GitHub repo. You can use this image as a base image for other images, using this in your `Dockerfile`: