diff --git a/src/cosmosmesh_privacy_preserving_federated/catopt_bridge.py b/src/cosmosmesh_privacy_preserving_federated/catopt_bridge.py
index 751c145..af26b47 100644
--- a/src/cosmosmesh_privacy_preserving_federated/catopt_bridge.py
+++ b/src/cosmosmesh_privacy_preserving_federated/catopt_bridge.py
@@ -194,15 +194,15 @@ __all__ = [
     "GoCRegistry",
     "to_catopt",
     "from_catopt",
-    # test-facing/new surface
+    # test-facing surface aliases for backwards compatibility
     "SharedVariable",
     "DualVariable",
+    # compatibility with existing tooling in this repository
     "CatOptBridge",
     "GraphOfContracts",
     "sample_end_to_end_mapping",
 ]
 
-
 class GraphOfContracts:
     """Tiny in-memory registry compatible with tests."""