diff --git a/books/free-programming-books-langs.md b/books/free-programming-books-langs.md
index 7c6591309..8ff0c0b85 100644
--- a/books/free-programming-books-langs.md
+++ b/books/free-programming-books-langs.md
@@ -958,7 +958,7 @@ Books on general-purpose programming that don't focus on a specific language are
 * [Essential HTML Canvas](https://www.programming-books.io/essential/htmlcanvas/) - Krzysztof Kowalczyk, StackOverflow Contributors
 * [GA Dash](https://dash.generalassemb.ly)
 * [Google's HTML/CSS Style Guide](https://google.github.io/styleguide/htmlcssguide.html)
-* [How To Build a Website with HTML](https://www.digitalocean.com/community/books/how-to-build-a-website-with-html-ebook) - Erin Glass (PDF, EPUB)
+* [How To Build a Website with HTML](https://www.digitalocean.com/community/books/how-to-build-a-website-with-html-ebook) - Erin Glass (PDF, EPUB) (CC BY-NC-SA)
 * [How to Code in HTML5 and CSS3](https://web.archive.org/web/20180816174417/http://howtocodeinhtml.com/HowToCodeInHTML5AndCSS3.pdf) - Damian Wielgosik (PDF) *(:card_file_box: archived)*
 * [HTML Canvas Deep Dive](http://joshondesign.com/p/books/canvasdeepdive/toc.html) - Josh Marinacci
 * [HTML Dog Tutorials](http://www.htmldog.com)