ecosystem:jquery wrongly mentioned in NPM guide?

ecosystem:jquery wrongly mentioned in NPM guide?

In  instructions for publishing your plugin to npm along with "jquery-plugin" keyword for package.json the "ecosystem:jquery" keyword is mentioned as a second one. But seems there is no such plugins with this keyword so far (except of mine). Have I misunderstood the instructions and is there a need for such keyword at all?

Thanks, 
Sasha (xml4jQuery plugin)