diff --git a/README.md b/README.md
index 1e505fa..9afe796 100644
--- a/README.md
+++ b/README.md
@@ -2,7 +2,7 @@
 
 A simple shoot game written in Python.
 
-# Introduce
+# Introduction
 
 This project only include two simple .py files: 
 
@@ -23,8 +23,11 @@ $ python mainGame.py
 # License
 GPL
 
-#Screeshot
+# Screeshot
 
 ![](http://s2.postimg.org/728c1wy4p/Screenshot_5.png)
 
 ![](http://s30.postimg.org/fflxcv9ld/Screenshot_6.png)
+
+# Doc
+[使用Pygame制作微信打飞机游戏PC版](https://www.cnblogs.com/dukeleo/p/3339780.html) (a Chinese startup)
diff --git a/mainGame.py b/mainGame.py
index 07d4295..91df38f 100644
--- a/mainGame.py
+++ b/mainGame.py
@@ -77,7 +77,7 @@
 
 while running:
     # 控制游戏最大帧率为60
-    clock.tick(60)
+    clock.tick(45)
 
     # 控制发射子弹频率,并发射子弹
     if not player.is_hit: