*
* Because this sensor is on-change, events must be generated when and only
* when heart_rate.bpm or heart_rate.status have changed since the last
- * event. The event should be generated no faster than every period_ns passed
- * to setDelay() or to batch(). See the definition of the on-change trigger
- * mode for more information.
+ * event. In particular, upon the first activation, unless the device is known
+ * to not be on the body, the status field of the first event must be set to
+ * SENSOR_STATUS_UNRELIABLE. The event should be generated no faster than every
+ * period_ns passed to setDelay() or to batch().
+ * See the definition of the on-change trigger mode for more information.
*
* sensor_t.requiredPermission must be set to SENSOR_PERMISSION_BODY_SENSORS.
*/