These docs are for an old release. Info on upgrading to v5
requires Premium edit doc

resources (as an array)

Tells the calendar to display resources from an array input.

var calendar = new Calendar(calendarEl, {
  resources: [
    {
      id: 'a',
      title: 'Room A'
    },
    {
      id: 'b',
      title: 'Room B'
    }
  ]
});

The id property is the most important because it allows associating events with resources. See Resource parsing spec for a full list of fields.