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diff --git a/TODO.md b/TODO.md
index 990ac18..7f2646d 100644
--- a/TODO.md
+++ b/TODO.md
@@ -45,6 +45,7 @@ Puppet modules
 
 ### Security
 
+- knock integration via https://github.com/juasiepo/knockd
 - apache:
   - try libapache2-modsecurity.
   - deploy https://git.immerda.ch/csp-report/