diff --git a/xxl-job-core/src/main/java/com/xxl/job/core/log/XxlJobFileAppender.java b/xxl-job-core/src/main/java/com/xxl/job/core/log/XxlJobFileAppender.java
index 538a973e..1315be06 100644
--- a/xxl-job-core/src/main/java/com/xxl/job/core/log/XxlJobFileAppender.java
+++ b/xxl-job-core/src/main/java/com/xxl/job/core/log/XxlJobFileAppender.java
@@ -16,7 +16,7 @@ import java.util.Date;
 public class XxlJobFileAppender {
 	private static Logger logger = LoggerFactory.getLogger(XxlJobFileAppender.class);
 	
-	// for JobThread (support log for child thread)
+	// for JobThread (support log for child thread of job handler)
 	//public static ThreadLocal<String> contextHolder = new ThreadLocal<String>();
 	public static InheritableThreadLocal<String> contextHolder = new InheritableThreadLocal<String>();
 	public static SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");