Update README.md about obsolete

README.md

@@ -1,16 +1,22 @@
 # malfunction
 
-A first 3D game made using "Castle Game Engine" and Blender and VRML models. Done a long time ago (before 2004). Please *do not* use the sources of this game as an example how to use "Castle Game Engine" --- we use here a lot of old, deprecated and uncomfortable ways to deal with 3D stuff!
+## This is a very old application; do not use this to learn Castle Game Engine!
 
-Complete documentation on http://castle-engine.sourceforge.net/malfunction.php .
+This application was developed using a very old _Castle Game Engine_ version. It still builds with the latest engine version (it is even tested by [GitHub Actions](https://castle-engine.io/github_actions) to make sure we maintain backward-compatibility) but it's absolutely *not* how I would go about implementing this game type now.
 
-Using Castle Game Engine, see http://castle-engine.sourceforge.net/ .
+*Do not use this game as a learning example.* Instead, get [latest Castle Game Engine](https://castle-engine.io/) and browse `examples` inside the installed engine.
+
+This project is maintained here only:
+- for historical purposes
+- and as part of automated test to make sure we maintain backward-compatibility when developing new engine versions.
 
-## Big TODO
+## Introduction
 
-**Do not use this code a basis for your projects. It uses really outdated Castle Game Engine API with outdated (deprecated) direct OpenGL fixed-function access.** This is not a way to render on modern GPUs, and this is not a way to use Castle Game Engine :)
+A first 3D game made using "Castle Game Engine" and Blender and VRML models. Done a long time ago (before 2004). Please *do not* use the sources of this game as an example how to use "Castle Game Engine" --- we use here a lot of old, deprecated and uncomfortable ways to deal with 3D stuff!
+
+Complete documentation on http://castle-engine.sourceforge.net/malfunction.php .
 
-This project is only for historical purposes.
+Using Castle Game Engine, see http://castle-engine.sourceforge.net/ .
 
 ## License