diff --git a/README.md b/README.md
index 70c8560..e131a39 100644
--- a/README.md
+++ b/README.md
@@ -224,12 +224,12 @@ import (
 
 func main() {
   keve := robotgo.AddEvent("k")
-  if keve == 0 {
+  if keve {
     fmt.Println("you press... ", "k")
   }
 
   mleft := robotgo.AddEvent("mleft")
-  if mleft == 0 {
+  if mleft {
     fmt.Println("you press... ", "mouse left button")
   }
 }
diff --git a/README_zh.md b/README_zh.md
index cda4fc6..daad65a 100644
--- a/README_zh.md
+++ b/README_zh.md
@@ -221,12 +221,12 @@ import (
 
 func main() {
   keve := robotgo.AddEvent("k")
-  if keve == 0 {
+  if keve {
     fmt.Println("you press... ", "k")
   }
 
   mleft := robotgo.AddEvent("mleft")
-  if mleft == 0 {
+  if mleft {
     fmt.Println("you press... ", "mouse left button")
   }
 }
diff --git a/docs/doc.md b/docs/doc.md
index 17a323b..b5fe095 100644
--- a/docs/doc.md
+++ b/docs/doc.md
@@ -531,12 +531,12 @@ import (
 
 func main() {
   keve := robotgo.AddEvent("k")
-  if keve == 0 {
+  if keve {
     fmt.Println("you press...", "k")
   }
 
   mleft := robotgo.AddEvent("mleft")
-  if mleft == 0 {
+  if mleft {
     fmt.Println("you press...", "mouse left button")
   }
 } 
diff --git a/docs/doc_zh.md b/docs/doc_zh.md
index ebd6761..774df82 100644
--- a/docs/doc_zh.md
+++ b/docs/doc_zh.md
@@ -545,12 +545,12 @@ import (
 
 func main() {
   keve := robotgo.AddEvent("k")
-  if keve == 0 {
+  if keve {
     fmt.Println("you press...", "k")
   }
 
   mleft := robotgo.AddEvent("mleft")
-  if mleft == 0 {
+  if mleft {
     fmt.Println("you press...", "mouse left button")
   }
 } 
diff --git a/examples/README.md b/examples/README.md
index 9e6f5d8..51cfd3e 100644
--- a/examples/README.md
+++ b/examples/README.md
@@ -111,12 +111,12 @@ import (
 
 func main() {
   keve := robotgo.AddEvent("k")
-  if keve == 0 {
+  if keve {
     fmt.Println("you press...", "k")
   }
 
   mleft := robotgo.AddEvent("mleft")
-  if mleft == 0 {
+  if mleft {
     fmt.Println("you press...", "mouse left button")
   }
 } 
diff --git a/examples/color-picker/main.go b/examples/color-picker/main.go
index afaafa4..ea29ca2 100644
--- a/examples/color-picker/main.go
+++ b/examples/color-picker/main.go
@@ -8,7 +8,7 @@ import (
 
 func colorPicker() {
 	m := robotgo.AddEvent("mleft")
-	if m == 0 {
+	if m {
 		x, y := robotgo.GetMousePos()
 		fmt.Println("mouse pos: ", x, y)