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@@ -474,6 +474,35 @@ accessible at the target port on every node regardless if there is a task for
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the service running on the node. For more information refer to
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[Use swarm mode routing mesh](https://docs.docker.com/engine/swarm/ingress/).
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+### Publish a port for TCP only or UCP only
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+
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+By default, when you publish a port, it is a TCP port. You can
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+specifically publish a UDP port instead of or in addition to a TCP port. When
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+you publish both TCP and UDP ports, Docker 1.12.2 and earlier require you to
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+add the suffix `/tcp` for TCP ports. Otherwise it is optional.
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+
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+#### TCP only
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+
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+The following two commands are equivalent.
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+
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+```bash
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+$ docker service create --name dns-cache -p 53:53 dns-cache
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+
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+$ docker service create --name dns-cache -p 53:53/tcp dns-cache
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+```
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+
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+#### TCP and UDP
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+
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+```bash
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+$ docker service create --name dns-cache -p 53:53/tcp -p 53:53/udp dns-cache
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+```
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+
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+#### UDP only
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+
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+```bash
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+$ docker service create --name dns-cache -p 53:53/udp dns-cache
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+```
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+
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### Create services using templates
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You can use templates for some flags of `service create`, using the syntax
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