diff --git a/README.md b/README.md
index fa8abc7f1..0ea271cb5 100644
--- a/README.md
+++ b/README.md
@@ -16,12 +16,16 @@ The feedbacks is checked every day.
 
 # How to compile the game?
 
-1. Download Unity 5.1.3 (https://unity3d.com/cn/get-unity/download/archive).
+1. Download Unity 5.6.2 (https://unity3d.com/cn/get-unity/download/archive).
 
 2. Clone the repository.
 
 3. Double click Assets\main.unity to open the solution.
 
+*Note that this is only the core engine and that it won't work without the required "game data".*<br>
+*The game data are still covered by the original konami copyright and must be obeyed as usual.*<br>
+*See : https://github.com/msfwaifu/YGOProUnity_V2_Data*
+
 # How to compile the ocgcore wrapper?
 
 *In most case you do not need to care about the ocgcore wrapper.*
@@ -42,4 +46,4 @@ The feedbacks is checked every day.
 
 2. build the c++ solution in x64 and release mode and you get the **ocgcore.dll**
 
-3. copy it into **YGOProUnity_V2\Assets\Plugins**
\ No newline at end of file
+3. copy it into **YGOProUnity_V2\Assets\Plugins**