diff --git a/README.md b/README.md
index 826718d..cd6394d 100644
--- a/README.md
+++ b/README.md
@@ -237,14 +237,18 @@ func main() {
 
     if len(fpid) > 0 {
       robotgo.ActivePID(fpid[0])
+
+      robotgo.Kill(fpid[0])
     }
   }
 
   robotgo.ActiveName("chrome")
 
   isExist, err := robotgo.PidExists(100)
-  if err == nil {
+  if err == nil && isExist {
     fmt.Println("pid exists is", isExist)
+
+    robotgo.Kill(100)
   }
 
   abool := robotgo.ShowAlert("test", "robotgo")
diff --git a/README_zh.md b/README_zh.md
index 5d8210a..b16851e 100644
--- a/README_zh.md
+++ b/README_zh.md
@@ -235,14 +235,18 @@ func main() {
 
     if len(fpid) > 0 {
       robotgo.ActivePID(fpid[0])
+
+      robotgo.Kill(fpid[0])
     }
   }
 
   robotgo.ActiveName("chrome")
 
   isExist, err := robotgo.PidExists(100)
-  if err == nil {
+  if err == nil && isExist {
     fmt.Println("pid exists is", isExist)
+
+    robotgo.Kill(100)
   }
 
   abool := robotgo.ShowAlert("test", "robotgo")
diff --git a/examples/main.go b/examples/main.go
index f95fad8..5f28948 100644
--- a/examples/main.go
+++ b/examples/main.go
@@ -308,6 +308,8 @@ func window() {
 		fmt.Println("pids...", fpid)
 		if len(fpid) > 0 {
 			robotgo.ActivePID(fpid[0])
+
+			robotgo.Kill(fpid[0])
 		}
 	}
 
@@ -315,8 +317,10 @@ func window() {
 
 	// determine whether the process exists
 	isExist, err := robotgo.PidExists(100)
-	if err == nil {
+	if err == nil && isExist {
 		fmt.Println("pid exists is", isExist)
+
+		robotgo.Kill(100)
 	}
 
 	// get the all process id
diff --git a/examples/window/main.go b/examples/window/main.go
index d562228..4bb3181 100644
--- a/examples/window/main.go
+++ b/examples/window/main.go
@@ -57,6 +57,8 @@ func main() {
 		fmt.Println("pids...", fpid)
 		if len(fpid) > 0 {
 			robotgo.ActivePID(fpid[0])
+
+			robotgo.Kill(fpid[0])
 		}
 	}
 
@@ -64,8 +66,10 @@ func main() {
 
 	// determine whether the process exists
 	isExist, err := robotgo.PidExists(100)
-	if err == nil {
+	if err == nil && isExist {
 		fmt.Println("pid exists is", isExist)
+
+		robotgo.Kill(100)
 	}
 
 	// get the all process id
diff --git a/robotgo.go b/robotgo.go
index 77b840d..0e7ee3c 100644
--- a/robotgo.go
+++ b/robotgo.go
@@ -63,7 +63,7 @@ import (
 )
 
 const (
-	version string = "v0.48.0.506, Ben Nevis!"
+	version string = "v0.48.0.508, Ben Nevis!"
 )
 
 type (
@@ -1414,7 +1414,7 @@ func ActiveName(name string) error {
 }
 
 // Kill kill the process by PID
-func Kill(pid int) error {
-	ps := os.Process{Pid: pid}
+func Kill(pid int32) error {
+	ps := os.Process{Pid: int(pid)}
 	return ps.Kill()
 }