diff --git a/whatsmars-common/src/test/java/org/hongxi/java/util/concurrent/ForkJoinTest.java b/whatsmars-common/src/test/java/org/hongxi/java/util/concurrent/ForkJoinTest.java
index b864f494bcc4905e5b28915bbd36fb60d66c58d9..910604cb1f0f4d3ec45469ad6c099a6e57b40f48 100644
--- a/whatsmars-common/src/test/java/org/hongxi/java/util/concurrent/ForkJoinTest.java
+++ b/whatsmars-common/src/test/java/org/hongxi/java/util/concurrent/ForkJoinTest.java
@@ -2,9 +2,14 @@ package org.hongxi.java.util.concurrent;
 
 import java.util.concurrent.ForkJoinPool;
 import java.util.concurrent.RecursiveTask;
+import java.util.concurrent.RecursiveAction;
+import java.util.concurrent.CountedCompleter;
 
 /**
  * @author shenhongxi 2019/8/11
+ *
+ * @see RecursiveAction
+ * @see CountedCompleter
  */
 public class ForkJoinTest {