ADDITIONAL SYSTEM INFORMATION :
Java 14 (Dec 27, 2019) / Windows 10

A DESCRIPTION OF THE PROBLEM :
When creating an application using jpackage, there is a high probability that you want your application to use a specific icon other than the default waving Duke icon.
jpackage allows it using the --icon option but this option is documented nowhere
https://openjdk.java.net/jeps/343
https://dzone.com/articles/a-brief-example-using-the-early-access-jpackage-ut
Devoxx presentation

I had to find out reading the jdk source code.

Please add the --icon to the https://openjdk.java.net/jeps/343 page