diff --git a/README.md b/README.md
index 451bb34..e640b28 100644
--- a/README.md
+++ b/README.md
@@ -72,7 +72,8 @@ int read_button_pin()
 int main()
 {
     button_init(&button1, read_button_pin, 0);
-    button_attach(&button1, SINGLE_CLICK,     BTN1_SINGLE_CLICK_Handler);
+    button_attach(&button1, PRESSED,          BTN1_PRESSED_Handler);
+    button_attach(&button1, CLICK,            BTN1_CLICK_Handler);
     button_attach(&button1, DOUBLE_CLICK,     BTN1_DOUBLE_Click_Handler);
     button_attach(&button1, LONG_RRESS_START, BTN1_LONG_RRESS_START_Handler);
     button_attach(&button1, LONG_PRESS_HOLD,  BTN1_LONG_PRESS_HOLD_Handler);
diff --git a/button.c b/button.c
index 4b16e31..380f4e5 100644
--- a/button.c
+++ b/button.c
@@ -5,8 +5,6 @@
  
 #include "button.h"
 
-#define HIGH              1
-#define LOW               0
 #define TICKS_INTERVAL    5	//ms
 
 //According to your need to modify the constants.
diff --git a/button.h b/button.h
index 8e0903b..321efcb 100644
--- a/button.h
+++ b/button.h
@@ -1,3 +1,8 @@
+/*
+ * Copyright (c) 2016 Zibin Zheng <znbin@qq.com>
+ * All rights reserved
+ */
+ 
 #ifndef _BUTTON_H_
 #define _BUTTON_H_