These docs are for an old release. Info on upgrading to v5

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.