diff --git a/books/free-programming-books-subjects.md b/books/free-programming-books-subjects.md
index 1e4c51721..c00055450 100644
--- a/books/free-programming-books-subjects.md
+++ b/books/free-programming-books-subjects.md
@@ -760,6 +760,7 @@ Kerridge (PDF) (email address *requested*, not required)
 * [OWASP Mobile Security Testing Guide](https://mobile-security.gitbook.io/mobile-security-testing-guide/) - Bernhard Mueller et al.
 * [OWASP Testing Guide 4.2](https://owasp.org/www-project-web-security-testing-guide/v42/) - The OWASP® Foundation (HTML, [PDF](https://github.com/OWASP/wstg/releases/download/v4.2/wstg-v4.2.pdf))
 * [OWASP Top 10 for .NET Developers](http://www.troyhunt.com/2011/12/free-ebook-owasp-top-10-for-net.html)
+* [Practical Cryptography for Developer](https://cryptobook.nakov.com) - Svetlin Nakov (GitBook) (:construction: *in process*)
 * [Security Engineering](http://www.cl.cam.ac.uk/~rja14/book.html)
 * [The Joy of Cryptography (2021)](https://joyofcryptography.com/pdf/book.pdf) - Mike Rosulek (PDF)