A computing device is described that receives a notification generated by a notification source, determines a set of notification channels defined by the notification source, each notification channel having one or more parameters defined by the notification source, and determines a particular notification channel from the set of notification channels assigned to the notification. The computing device determines one or more parameters of the particular notification channel and outputs an indication of the notification according to the one or more parameters of the particular notification channel. In this way, a user may be provided with an indication of the manner in which a given notification is being handled by the computing device. This may provide further information on the notification itself and allow efficient interaction in light of the knowledge thereby provided.