Allow defining servers and their keys
diff --git a/README.md b/README.md
index 33e1471..3be2edb 100644
--- a/README.md
+++ b/README.md
@@ -10,6 +10,10 @@
           keyname:
             secret: xyz
             algorithm: hmac-sha512
+        server:
+          8.8.8.8:
+            keys:
+              - keyname
         zone:
           sub.domain.com:
             ttl: 86400