diff --git a/books/free-programming-books-langs.md b/books/free-programming-books-langs.md
index 677bce06e..53de0cfe7 100644
--- a/books/free-programming-books-langs.md
+++ b/books/free-programming-books-langs.md
@@ -1137,6 +1137,7 @@ That section got so big, we decided to split it into its own file, the [BY SUBJE
 * [Single page apps in depth](http://singlepageappbook.com) - Mixu (HTML)
 * [Speaking JavaScript](http://speakingjs.com/es5/) - Dr. Axel Rauschmayer
 * [Standard ECMA-262 ECMAScript 2016 Language Specification](https://www.ecma-international.org/publications/standards/Ecma-262.htm) - Ecma International (HTML,PDF)
+* [The Code Challenge Book](https://s3.amazonaws.com/coderbytestaticimages/CoderbyteEbook.pdf) - Daniel Borowski (PDF)
 * [The JavaScript Beginner's Handbook](https://flaviocopes.com/page/javascript-handbook/) - Flavio Copes (PDF, EPUB, Kindle) *(email address requested)*
 * [The JavaScript Way](https://github.com/bpesquet/thejsway) - Baptiste Pesquet
 * [The Modern JavaScript Tutorial](https://javascript.info) - Ilya Kantor (HTML)