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 @@
 /**
    \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