Quick note on how to get a local preview

README.md

@@ -21,6 +21,14 @@ We'd like to ask you to familiarize yourself with our [Contribution Guide](CONTR
 the [more detailed guidelines][lesson-example] on proper formatting, ways to render the lesson locally, and even
 how to write new episodes.
 
+Quick summary of how to get a local preview: Install [jekyll](https://jekyllrb.com/) and then run
+
+```
+make serve
+# or after the first time
+bundle exec jekyll serve
+```
+
 Please see the current list of [issues](https://github.com/hsf-training/hsf-training-matplotlib/issues) for ideas for contributing to this
 repository. For making your contribution, we use the GitHub flow, which is
 nicely explained in the chapter [Contributing to a Project](http://git-scm.com/book/en/v2/GitHub-Contributing-to-a-Project) in Pro Git