diff --git a/docs/client.rst b/docs/client.rst
index a147540..f93dec4 100644
--- a/docs/client.rst
+++ b/docs/client.rst
@@ -40,6 +40,9 @@
    // set delay time
    taskId,err=client.SetTaskCtl(client.RunAfter, 2*time.Second).Send("group1","add",12,33)
 
+   // set expire time
+   taskId,err=client.SetTaskCtl(client.ExpireTime,time.Now().Add(4*time.Second)).Send("group1","add",12,33)
+
 获取结果
 ----------
 
diff --git a/docs/expire.rst b/docs/expire.rst
new file mode 100644
index 0000000..f9420b5
--- /dev/null
+++ b/docs/expire.rst
@@ -0,0 +1,15 @@
+任务过期时间
+==============
+
+目前只支持在client端设置过期时间，若任务发生重试且重试开始的时间超过了过期时间，任务会直接终止
+
+.. code:: go
+
+   taskId, err :=client.SetTaskCtl(client.ExpireTime,time.Now().Add(4*time.Second)).Send("group1","add",12,33)
+
+   result, _ := client.GetResult(taskId, 2*time.Second, 300*time.Millisecond)
+
+   if result.Status == message.ResultStatus.Expired{
+         // do ...
+   }
+