diff --git a/README.md b/README.md
index 9f3119b7..e71522ae 100644
--- a/README.md
+++ b/README.md
@@ -515,9 +515,9 @@ To get started, simply fork this repo. Please refer to [CONTRIBUTING.md](CONTRIB
   - [Part 1](https://blog.asrpo.com/making_a_low_level_debugger)
   - [Part 2: C](https://blog.asrpo.com/making_a_low_level_debugger_part_2)
 - Implementing a Search Engine
-  - [Part 1](http://www.ardendertat.com/2011/05/30/how-to-implement-a-search-engine-part-1-create-index/)
-  - [Part 2](http://www.ardendertat.com/2011/05/31/how-to-implement-a-search-engine-part-2-query-index/)
-  - [Part 3](http://www.ardendertat.com/2011/07/17/how-to-implement-a-search-engine-part-3-ranking-tf-idf/)
+  - [Part 1](https://web.archive.org/web/20210614081424/http://www.ardendertat.com/2011/05/30/how-to-implement-a-search-engine-part-1-create-index/)
+  - [Part 2](https://web.archive.org/web/20210614063216/http://www.ardendertat.com/2011/05/31/how-to-implement-a-search-engine-part-2-query-index/)
+  - [Part 3](https://web.archive.org/web/20210615041205/http://www.ardendertat.com/2011/07/17/how-to-implement-a-search-engine-part-3-ranking-tf-idf/)
 - [Build the Game of Life](https://robertheaton.com/2018/07/20/project-2-game-of-life/)
 - [Create terminal ASCII art](https://robertheaton.com/2018/06/12/programming-projects-for-advanced-beginners-ascii-art/)
 - [Write a Tic-Tac-Toe AI](https://robertheaton.com/2018/10/09/programming-projects-for-advanced-beginners-3-a/)