Update README.md

Salvoxia · Nov 14, 2024 · ea6f985 · ea6f985
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@@ -34,6 +34,8 @@ None.
 
 ```yaml
 - hosts: dns
+  # Ensures that only one DNS host is changed at a time.
+  serial: 1
   roles:
     - role: ngine_io.blocky_dns
 ```