diff --git a/harden b/harden
index 583c3f0..ca1c535 100755
--- a/harden
+++ b/harden
@@ -492,6 +492,9 @@ EOF
 }
 
 function dynamicDockerPortsCronjob {
+# Part of the code responsible for the comparison
+# of the arrays was taken from:
+# https://stackoverflow.com/questions/2312762/compare-difference-of-two-arrays-in-bash
     sudo mkdir -p /root/bin
     cat << 'TOHERE' | sudo tee /root/bin/dynamic_docker_ports_cronjob.sh > /dev/null 2>&1
 #!/usr/bin/env bash