diff --git a/doc/topics/engines/index.rst b/doc/topics/engines/index.rst
index 8b47ad2620af..5fbc99a0b930 100644
--- a/doc/topics/engines/index.rst
+++ b/doc/topics/engines/index.rst
@@ -25,6 +25,7 @@ Salt engines are configured under an ``engines`` top-level section in your Salt
      - logstash:
          host: log.my_network.com
          port: 5959
+         proto: tcp
 
 Salt engines must be in the Salt path, or you can add the ``engines_dirs`` option in your Salt master configuration with a list of directories under which Salt attempts to find Salt engines.