diff --git a/utk_exodus/collection/__init__.py b/utk_exodus/collection/__init__.py
index 854e67b..636efc9 100644
--- a/utk_exodus/collection/__init__.py
+++ b/utk_exodus/collection/__init__.py
@@ -1 +1,3 @@
-from .collection import CollectionMetadata, CollectionImporter
\ No newline at end of file
+from .collection import CollectionMetadata, CollectionImporter
+
+__all__ = ["CollectionMetadata", "CollectionImporter"]