Update README.md

Author: Leopard20

README.md

@@ -30,4 +30,4 @@ Building is fairly straight-forward and no different than making other ARMA mods
 1. Convert the folder `AIO_AIMENU` to .pbo using ARMA Tools.
 2. Create a folder called `@AIO_AIMenu`, and inside this folder create another folder called `addons`.
 3. Place the .pbo file inside the `addons` folder.
-4. Move the `AIO_AIMENU` folder to your ARMA 3 installation directory.
+4. Move the `@AIO_AIMENU` folder to your ARMA 3 installation directory.