diff --git a/README.md b/README.md
index 4a5e78b..ff18de9 100644
--- a/README.md
+++ b/README.md
@@ -101,6 +101,7 @@ IT automation tools like [Ansible](https://www.ansible.com/), [Chef](https://www
 - [ ] `logwatch`
 - [ ] Rkhunter and chrootkit
 - [ ] AppArmor
+- [ ] port knockers for SSH
 
 ([Table of Contents](#table-of-contents))