README: add io documentation step
diff --git a/README.md b/README.md
index f6d545e..116be03 100644
--- a/README.md
+++ b/README.md
@@ -8,7 +8,9 @@
1. [Set GitHub Pages](https://tinytapeout.com/faq/#my-github-action-is-failing-on-the-pages-part) `Sources` as `GitHub Actions`.
-1. Create a new [Wokwi](https://wokwi.com/projects/339800239192932947) project and update [`info.yaml`](info.yaml) with your `wokwi_id`.
+1. Create a new [Wokwi](https://wokwi.com/projects/339800239192932947) project.
+
+1. Update [`info.yaml`](info.yaml) with your `wokwi_id` and make sure the `documentation` for `inputs` and `outputs` matches the Wokwi design.
1. Commit, push and check the [![user_project_ci](https://github.com/proppy/tiny_caravel_user_project/actions/workflows/user_project_ci.yml/badge.svg)](https://github.com/proppy/tiny_caravel_user_project/actions/workflows/user_project_ci.yml) workflow summary (if successful a new commit including the hardened files will be automatically created).