Apply suggestions from code review

README.md

@@ -43,10 +43,10 @@ python3 -m http.server 9000 --directory public
 
 ## Test the docs locally
 
-To ensure all python snippets are properly formatted before creating a PR, install [flake8-markdown](https://github.com/johnfraney/flake8-markdown) and add the following like to `.git/hooks/pre-commit`:
+To ensure all python snippets are properly formatted before creating a commit, install [flake8-markdown](https://github.com/johnfraney/flake8-markdown) and add the following like to `.git/hooks/pre-commit`:
 
 ```sh
-flake8-markdown "docs/**/*.md"
+flake8-markdown  $(git diff --diff-filter=d --name-only HEAD | grep '\.md$')
 ```
 
 To ensure your markdown is properly formatted, run `make markdowntest`.