diff --git a/books/free-programming-books-subjects.md b/books/free-programming-books-subjects.md
index 24468291a..ea635ec00 100644
--- a/books/free-programming-books-subjects.md
+++ b/books/free-programming-books-subjects.md
@@ -747,6 +747,7 @@ Kerridge (PDF) (email address *requested*, not required)
 * [Handbook of Applied Cryptography](http://cacr.uwaterloo.ca/hac/index.html)
 * [How HTTPS works](https://howhttps.works) - dnsimple
 * [How to deal with Passwords](https://github.com/MHM5000/pass)
+* [Information Security Management](https://www.infosecuritybook.com) - Marcos Sêmola (PDF)
 * [Intrusion Detection Systems with Snort](http://ptgmedia.pearsoncmg.com/images/0131407333/downloads/0131407333.pdf) (PDF)
 * [OpenSSL Cookbook](https://www.feistyduck.com/library/openssl-cookbook/)
 * [OWASP Mobile Security Testing Guide](https://mobile-security.gitbook.io/mobile-security-testing-guide/) - Bernhard Mueller et al.