diff --git a/books/free-programming-books-langs.md b/books/free-programming-books-langs.md
index 122bcc8de..00ceaee4c 100644
--- a/books/free-programming-books-langs.md
+++ b/books/free-programming-books-langs.md
@@ -1204,6 +1204,7 @@ Books on general-purpose programming that don't focus on a specific language are
 * [Robust Client-Side JavaScript](https://molily.de/robust-javascript/) - Matthias Schäfer (HTML, EPUB)
 * [Single page apps in depth](http://singlepageappbook.com) - Mixu (HTML)
 * [Software Design by Example: A Tool-Based Introduction with JavaScript](https://third-bit.com/sdxjs/) - Greg Wilson (HTML)
+* [Some drops of JavaScript](https://drops-of-javascript.hi-folks.dev) - Roberto Butti (HTML) (CC BY-NC-SA) *( :construction: in process)*
 * [Speaking JavaScript](https://exploringjs.com/es5/) - Axel Rauschmayer (HTML)
 * [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)