diff --git a/index.md b/index.md
index a06f596..8298273 100644
--- a/index.md
+++ b/index.md
@@ -88,6 +88,12 @@ example page of <a target="_blank" href="./samples/index.html">web development</
 
 ## My projects:
 
+### AirForce: 
+
+[A simple Python game with Pygame and sample of OOP programming](https://stoneskin.github.io/AirForce/)
+([link to repository](https://github.com/stoneskin/AirForce))
+
+
 ### CCRApp:
 
 MLCCC Chinese Characters Recognition App ([Demo of Html Prototype](https://stoneskin.github.io/Demo/CCRApp/login.html){:target="_blank"})
diff --git a/python/2_LearnPython/10.3.PyGameStepByStep-1.md b/python/2_LearnPython/10.3.PyGameStepByStep-1.md
index 06c4c1c..ca9a313 100644
--- a/python/2_LearnPython/10.3.PyGameStepByStep-1.md
+++ b/python/2_LearnPython/10.3.PyGameStepByStep-1.md
@@ -1,5 +1,7 @@
 # 10.3 Build a AirForce Game step by step (Part 1)
 
+Below content and code be moved to https://stoneskin.github.io/AirForce/ ([repo](https://github.com/stoneskin/AirForce))
+
 ## 10.3.1 Step1 Initial the PYGame
 
 - Create a project folder, and add a images folder in the project folder
diff --git a/python/2_LearnPython/10.4.PyGameStepByStep-2.md b/python/2_LearnPython/10.4.PyGameStepByStep-2.md
index c2851ee..44808f2 100644
--- a/python/2_LearnPython/10.4.PyGameStepByStep-2.md
+++ b/python/2_LearnPython/10.4.PyGameStepByStep-2.md
@@ -1,5 +1,7 @@
 # 10.4 Build a AirForce Game step by step (Part 2)
 
+Below content and code be moved to https://stoneskin.github.io/AirForce/ ([repo](https://github.com/stoneskin/AirForce))
+
 ## 10.4.1 Step 5: Add Enemies
 
 - Prepare images for enemies