Make it clearer that this is about the development version

index.rst

@@ -3,8 +3,11 @@
    You can adapt this file completely to your liking, but it should at least
    contain the root `toctree` directive.
 
-Welcome to Godot Engine's documentation!
-========================================
+Document for Godot Engine (master branch)
+=========================================
+
+Looking for the documentation of the current **stable** version? `Have a look here
+<http://docs.godotengine.org/en/stable>`_.
 
 **Note:** Godot Engine is an open source project developed by a community of volunteers.
 It means that the documentation team can always use your feedback and help to improve our