diff --git a/books/free-programming-books-subjects.md b/books/free-programming-books-subjects.md
index 6aedb944c..fa30f8655 100644
--- a/books/free-programming-books-subjects.md
+++ b/books/free-programming-books-subjects.md
@@ -895,6 +895,7 @@ Kerridge (PDF) (email address *requested*, not required)
 * [Security Engineering](https://www.cl.cam.ac.uk/~rja14/book.html)
 * [The Joy of Cryptography (2021)](https://joyofcryptography.com/pdf/book.pdf) - Mike Rosulek (PDF)
 * [The MoonMath Manual to zk-SNARKs](https://leastauthority.com/community-matters/moonmath-manual/) - Least Authority
+* [The SELINUX Coloring Book](https://github.com/mairin/selinux-coloring-book) -  Daniel J Walsh, Máirín Duffy (PDF) (CC BY-SA)
 * [The SELinux Notebook](https://github.com/SELinuxProject/selinux-notebook) - Richard Haines, Paul Moore, SELinux Community (HTML, PDF, EPUB, azw3) (GFDL)