diff --git a/iot-machine-data-event/src/main/java/com/qniao/iot/machine/event/MachineIotDataReceivedEvent.java b/iot-machine-data-event/src/main/java/com/qniao/iot/machine/event/MachineIotDataReceivedEvent.java
index 416c5e2..941c634 100644
--- a/iot-machine-data-event/src/main/java/com/qniao/iot/machine/event/MachineIotDataReceivedEvent.java
+++ b/iot-machine-data-event/src/main/java/com/qniao/iot/machine/event/MachineIotDataReceivedEvent.java
@@ -53,7 +53,7 @@ public class MachineIotDataReceivedEvent implements Serializable {
     private Long currJobDuration;
 
     /**
-     * 当天的工作时长
+     * 当天的工作时长（单位秒）
      */
     private Long jobDurationOfTheDay;
 
@@ -63,7 +63,7 @@ public class MachineIotDataReceivedEvent implements Serializable {
     private Long jobCountOfTheDay;
 
     /**
-     * 当前周期的工作时长（周期：开机到关机）
+     * 当前周期的工作时长（周期：开机到关机（单位秒））
      */
     private Long jobDurationOfThePeriod;