diff --git a/worlds/__init__.py b/worlds/__init__.py
index ed48e32e..61014a2b 100644
--- a/worlds/__init__.py
+++ b/worlds/__init__.py
@@ -38,3 +38,5 @@ network_data_package = {
 # Set entire datapackage to version 0 if any of them are set to 0
 if any(not world.data_version for world in AutoWorldRegister.world_types.values()):
     network_data_package["version"] = 0
+    import logging
+    logging.warning("Datapackage is in custom mode.")