diff --git a/monitor/example/monitor.yaml b/monitor/example/monitor.yaml
index 1692800..fc6ca5e 100644
--- a/monitor/example/monitor.yaml
+++ b/monitor/example/monitor.yaml
@@ -19,6 +19,8 @@
 #    - name [The name of the fan sensor]
 #      has_target [true|false  If this sensor has a Target property for
 #                  setting a fan speed (otherwise just for reads)]
+#      target_interface [The fan target interface used by the sensor.
+#                        Default is "xyz.openbmc_project.Control.FanSpeed"]
 #      factor [The factor to multiply with target to calculate the expected
 #              fan speed. Default is 1 for fan speed target;
 #              Customized value for pwm target]