diff --git a/roles/dns/master/defaults/main.yml b/roles/dns/master/defaults/main.yml
index c1e8971..745b249 100644
--- a/roles/dns/master/defaults/main.yml
+++ b/roles/dns/master/defaults/main.yml
@@ -22,4 +22,6 @@ retry: 7200
 expire: 3600000
 ttl: "{{ global_dns_ttl }}"
 
+slaves: [] # for retriving IPs automatically by Ansible
+
 dname_subdomain: "external" # Must not contain the base domain, can be used to allow ignoring local overrides on purpose, will be ignored if empty