diff --git a/README.md b/README.md
index f89132d..7b45408 100644
--- a/README.md
+++ b/README.md
@@ -79,7 +79,8 @@ At the moment this is not useful for anyone but myself, if at some point I find
           * [The Rust Programming Language](https://doc.rust-lang.org/stable/book/) 📕 🆓
             * [Annotations](https://github.com/marceloboeira/trpl) 📝
             * SubProjects
-              * [grab](https://github.com/marceloboeira/grab) 👋🏼 like grep, but simpler [Chapters 12 project].
+              * [grab](https://github.com/marceloboeira/grab) 👋🏼 like grep, but simpler [Chapters' 12/13 project].
+              * [dull](https://github.com/marceloboeira/dull) 🤪 a dummy multi-thread HTTP server [Chapter's 20 project].
             * General Overview
               * [Aaron Turon - Rust: confident, productive systems programming](https://www.youtube.com/watch?v=C6dNx9pY7p8) 📼 🆓
               * [Steve Klabnik - The History of Rust](https://www.youtube.com/watch?v=79PSagCD_AY) 📼 🆓