diff --git a/README.md b/README.md
index 48cecf4..91ac46c 100644
--- a/README.md
+++ b/README.md
@@ -44,16 +44,16 @@ import (
 	"fmt"
 	"sync"
 	"sync/atomic"
+	"time"
 
 	"github.com/panjf2000/ants"
-	"time"
 )
 
 var sum int32
 
 func myFunc(i interface{}) error {
-	n := i.(int)
-	atomic.AddInt32(&sum, int32(n))
+	n := i.(int32)
+	atomic.AddInt32(&sum, n)
 	fmt.Printf("run with %d\n", n)
 	return nil
 }
@@ -65,6 +65,8 @@ func demoFunc() error {
 }
 
 func main() {
+	defer ants.Release()
+
 	runTimes := 1000
 
 	// use the common pool
@@ -88,10 +90,11 @@ func main() {
 		wg.Done()
 		return nil
 	})
+	defer p.Release()
 	// submit tasks
 	for i := 0; i < runTimes; i++ {
 		wg.Add(1)
-		p.Serve(i)
+		p.Serve(int32(i))
 	}
 	wg.Wait()
 	fmt.Printf("running goroutines: %d\n", p.Running())
diff --git a/README_ZH.md b/README_ZH.md
index afa1290..c06eb1a 100644
--- a/README_ZH.md
+++ b/README_ZH.md
@@ -45,16 +45,16 @@ import (
 	"fmt"
 	"sync"
 	"sync/atomic"
+	"time"
 
 	"github.com/panjf2000/ants"
-	"time"
 )
 
 var sum int32
 
 func myFunc(i interface{}) error {
-	n := i.(int)
-	atomic.AddInt32(&sum, int32(n))
+	n := i.(int32)
+	atomic.AddInt32(&sum, n)
 	fmt.Printf("run with %d\n", n)
 	return nil
 }
@@ -66,6 +66,8 @@ func demoFunc() error {
 }
 
 func main() {
+	defer ants.Release()
+
 	runTimes := 1000
 
 	// use the common pool
@@ -89,10 +91,11 @@ func main() {
 		wg.Done()
 		return nil
 	})
+	defer p.Release()
 	// submit tasks
 	for i := 0; i < runTimes; i++ {
 		wg.Add(1)
-		p.Serve(i)
+		p.Serve(int32(i))
 	}
 	wg.Wait()
 	fmt.Printf("running goroutines: %d\n", p.Running())
diff --git a/examples/main.go b/examples/main.go
index bbf7457..53ef719 100644
--- a/examples/main.go
+++ b/examples/main.go
@@ -26,9 +26,9 @@ import (
 	"fmt"
 	"sync"
 	"sync/atomic"
+	"time"
 
 	"github.com/panjf2000/ants"
-	"time"
 )
 
 var sum int32