Added a note about Android 11
diff --git a/include/SDL_system.h b/include/SDL_system.h
index 48878b7..d296ab1 100644
--- a/include/SDL_system.h
+++ b/include/SDL_system.h
@@ -123,6 +123,7 @@ extern DECLSPEC void * SDLCALL SDL_AndroidGetActivity(void);
/**
\brief Return API level of the current device
+ API level 30: Android 11
API level 29: Android 10
API level 28: Android 9
API level 27: Android 8.1