Update run.adoc (jenkins-infra#5422)

Co-authored-by: Tim Jacomb <21194782+timja@users.noreply.github.com>
MarkEWaite · Sep 5, 2022 · db735ce · db735ce
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commit db735ce
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diff --git a/content/doc/developer/tutorial/run.adoc b/content/doc/developer/tutorial/run.adoc
@@ -15,6 +15,8 @@ It also provides a convenient way to run a Jenkins instance with your plugin:
 [listing]
 mvn hpi:run
 
+NOTE: You may need to specify a port number for your plugin to use. You can specify a port like this *mvn hpi:run -Dport=5000*
+
 NOTE: To learn more about Maven HPI Plugin and the goals it provides, see link:https://jenkinsci.github.io/maven-hpi-plugin/[its documentation].
 
 This will set up a Jenkins instance on `\http://localhost:8080/jenkins/`. Wait for the following console output, then open a web browser and look at what the plugin does.