diff --git a/README_ZH.md b/README_ZH.md
index afa1290..a50e954 100644
--- a/README_ZH.md
+++ b/README_ZH.md
@@ -176,7 +176,7 @@ Memory : 8 GB 1867 MHz DDR3
 
 **从该demo测试吞吐性能对比可以看出，使用ants的吞吐性能相较于原生goroutine可以保持在2-6倍的性能压制，而内存消耗则可以达到10-20倍的节省优势。** 
 
-[1]: https://travis-ci.com/panjf2000/ants.svg?branch=master
+[1]: https://travis-ci.com/panjf2000/ants.svg?branch=develop
 [2]: https://travis-ci.com/panjf2000/ants
 [3]: https://godoc.org/github.com/panjf2000/ants?status.svg
 [4]: https://godoc.org/github.com/panjf2000/ants
diff --git a/examples/main.go b/examples/main.go
index 413cb36..bbf7457 100644
--- a/examples/main.go
+++ b/examples/main.go
@@ -47,6 +47,8 @@ func demoFunc() error {
 }
 
 func main() {
+	defer ants.Release()
+
 	runTimes := 1000
 
 	// use the common pool 
@@ -70,6 +72,7 @@ func main() {
 		wg.Done()
 		return nil
 	})
+	defer p.Release()
 	// submit tasks
 	for i := 0; i < runTimes; i++ {
 		wg.Add(1)