diff --git a/ecs/__init__.py b/ecs/__init__.py
index dc901bf..6bbf781 100644
--- a/ecs/__init__.py
+++ b/ecs/__init__.py
@@ -2,11 +2,14 @@
 
 from ecs import metadata as _metadata
 # Provide a common namespace for these classes.
-from ecs.models import Entity, Component, System  # NOQA
-from ecs.managers import EntityManager, SystemManager  # NOQA
+from ecs.models import Entity, Component, System
+from ecs.managers import EntityManager, SystemManager
 
 
 __version__ = _metadata.version
 __author__ = _metadata.authors[0]
 __license__ = _metadata.license
 __copyright__ = _metadata.copyright
+
+
+__all__ = ['Entity', 'Component', 'System', 'EntityManager', 'SystemManager']