diff --git a/scanslicer/controller.py b/scanslicer/controller.py
index 9f333e5..8d306d9 100644
--- a/scanslicer/controller.py
+++ b/scanslicer/controller.py
@@ -14,3 +14,6 @@ class ScanSlicerControllerMixin(
     ScanSlicerParamsMixin,
 ):
     """Composed controller mixin split by responsibility."""
+
+
+__all__ = ["ScanSlicerControllerMixin"]