diff --git a/README.md b/README.md
index 6107b7062..0d27e9c2d 100644
--- a/README.md
+++ b/README.md
@@ -139,6 +139,7 @@ It's a great way to learn.
 * [**Python**: _Write your own miniature Redis with Python_](http://charlesleifer.com/blog/building-a-simple-redis-server-with-python/)
 * [**Ruby**: _Build your own fast, persistent KV store in Ruby_](https://dineshgowda.com/posts/build-your-own-persistent-kv-store/)
 * [**Rust**: _Build your own Redis client and server_](https://tokio.rs/tokio/tutorial/setup)
+* [**Scala**: _Build your own SQL query planner from Scratch_](https://github.com/tuannh982/query-planner-guide)
 
 #### Build your own `Docker`