diff --git a/README.md b/README.md
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--- a/README.md
+++ b/README.md
@@ -455,6 +455,7 @@ It's a great way to learn.
 * [**PHP**: _Code a Web Search Engine in PHP_](https://boyter.org/2013/01/code-for-a-search-engine-in-php-part-1/)
 * [**Python**: _Build a Deep Learning Library_](https://www.youtube.com/watch?v=o64FV-ez6Gw) [video]
 * [**Python**: _How to Build a Kick-Ass Mobile Document Scanner in Just 5 Minutes_](https://www.pyimagesearch.com/2014/09/01/build-kick-ass-mobile-document-scanner-just-5-minutes/)
+* [**Python**: _How to build your first error-correction code in vanilla Python][(http://aosabook.org/en/500L/a-continuous-integration-system.html](https://quantum-for-the-confused.medium.com/building-your-first-error-correction-code-in-python-4c1da6d56876))
 * [**Python**: _Continuous Integration System_](http://aosabook.org/en/500L/a-continuous-integration-system.html)
 * [**Python**: _Recommender Systems in Python: Beginner Tutorial_](https://www.datacamp.com/community/tutorials/recommender-systems-python)
 * [**Python**: _Write SMS-spam detector with Scikit-learn_](https://medium.com/@kopilov.vlad/detect-sms-spam-in-kaggle-with-scikit-learn-5f6afa7a3ca2)