diff --git a/docs/CONTRIBUTING.md b/docs/CONTRIBUTING.md
index a0b3a0e7..09c9e061 100644
--- a/docs/CONTRIBUTING.md
+++ b/docs/CONTRIBUTING.md
@@ -25,6 +25,7 @@ When contributing to this repository, please [submit a new issue](https://github
 1. Create a new feature branch on top of the `dev` branch.
 1. Commit your code changes to this feature branch.
 1. Push the changes to your fork.
+1. Please format your code using [`isort`](https://pycqa.github.io/isort/) and [`black`](https://black.readthedocs.io) before submitting.
 1. Submit a new pull request, using `dev` as the base branch.
   - If your code changes or extends the WireViz YAML syntax, be sure to update the [syntax description document](https://github.com/formatc1702/WireViz/blob/dev/docs/syntax.md) in your PR.
 1. Please include in the PR description (and optionally also in the commit message body) a reference (# followed by issue number) to the issue where the suggested changes are discussed.