diff --git a/playbooks/tasks/app/ddns-route53.yml b/playbooks/tasks/app/ddns-route53.yml
index 4feacb7..b1dd39a 100644
--- a/playbooks/tasks/app/ddns-route53.yml
+++ b/playbooks/tasks/app/ddns-route53.yml
@@ -1,5 +1,8 @@
 #!/usr/bin/env ansible-playbook
 # vim:ft=ansible:
+#
+# https://crazymax.dev/ddns-route53/
+#
 - name: docker deploy ddns-route53
   docker_container:
     name: ddns-route53