be excellent

docs/play.en.md

@@ -3,6 +3,12 @@ HowTo play rC3 world
 
 This small tutorial is intended to give you a quick overview and some recommandations for the best rC3 world experience.
 
+## Be excellent to each other
+
+Please be excellent to each other as well as our infrastructure. The software for this game is new and therefor may contain bugs. If you want to go diggin for bugs please use our playground instance instead of the productive infrastructure.
+
+We will reserve the right to ban participants not behaving excellent.
+
 ## Recomendations
 
 ### Hardware/Devices