How to change order of the menu items of the modules into mean.io?

Question

I had added each module of my application to the menu of mean.io, into of the app.js file like this:

Theme.menus.add({
    title: 'theme example page',
    link: 'theme example page',
    roles: ['authenticated'],
    menu: 'main'
});

All modules are shown in my menu, but the order is wrong, How can change that order?