diff --git a/README.md b/README.md
index b17858f..3a35061 100644
--- a/README.md
+++ b/README.md
@@ -12,6 +12,7 @@ This is work in progress: please contribute by sending your suggestions. You may
   - [Hardening Guide Collections](#hardening-guide-collections)
   - [GNU/Linux](#gnulinux)
     - [Red Hat Enterprise Linux - RHEL](#red-hat-enterprise-linux---rhel)
+    - [CentOS](#centos)
     - [SUSE](#suse)
     - [Ubuntu](#ubuntu)
   - [Windows](#windows)
@@ -98,6 +99,10 @@ This is work in progress: please contribute by sending your suggestions. You may
 - [CIS Benchmark for Red Hat Linux](https://www.cisecurity.org/benchmark/red_hat_linux/)
 - [nixCraft - How to set up a firewall using FirewallD on RHEL 8](https://www.cyberciti.biz/faq/configure-set-up-a-firewall-using-firewalld-on-rhel-8/)
 
+### CentOS
+
+- [Lisenet - CentOS 7 Server Hardening Guide](https://www.lisenet.com/2017/centos-7-server-hardening-guide/)
+
 ### SUSE
 
 - [SUSE Linux Enterprise Server 12 SP4 Security Guide](https://www.suse.com/documentation/sles-12/singlehtml/book_security/book_security.html)