diff --git a/simulationdataschema/__init__.py b/simulationdataschema/__init__.py
index 219219c2..188e9f03 100644
--- a/simulationdataschema/__init__.py
+++ b/simulationdataschema/__init__.py
@@ -17,4 +17,3 @@
 # limitations under the License.
 #
 from .general import Simulation
-# from .model_system import ModelSystem, AtomicCell, Symmetry