diff --git a/core/src/main/java/com/alibaba/datax/core/job/JobContainer.java b/core/src/main/java/com/alibaba/datax/core/job/JobContainer.java
index 50f1cf7b..acc552cc 100755
--- a/core/src/main/java/com/alibaba/datax/core/job/JobContainer.java
+++ b/core/src/main/java/com/alibaba/datax/core/job/JobContainer.java
@@ -467,7 +467,7 @@ public class JobContainer extends AbstractContainer {
         if (this.needChannelNumber < Integer.MAX_VALUE) {
             return;
         }
-
+        // 通过channel调节Job运行速度
         boolean isChannelLimit = (this.configuration.getInt(
                 CoreConstant.DATAX_JOB_SETTING_SPEED_CHANNEL, 0) > 0);
         if (isChannelLimit) {