diff --git a/inventory/group_vars/all/bind.yaml b/inventory/group_vars/all/bind.yaml
index 562fec2..09f2e14 100644
--- a/inventory/group_vars/all/bind.yaml
+++ b/inventory/group_vars/all/bind.yaml
@@ -1,3 +1,6 @@
+bind_acme_key: # generate key with dnssec-keygen -a HMAC-SHA512 -b 512 -n HOST keyname
+bind_update_key: # generate key...
+
 bind_nameservers:
     - ns1.f2odns.de
     - ns2.f2odns.de