diff --git a/examples/multiple_stp_files.py b/examples/multiple_stp_files.py
index 8a16b2c..8099094 100644
--- a/examples/multiple_stp_files.py
+++ b/examples/multiple_stp_files.py
@@ -4,4 +4,6 @@
 my_model.add_stp_file("two_connected_cubes.stp", material_tags=["mat1", "mat2"])
 my_model.add_stp_file("single_sphere.stp", material_tags=["mat3"])
 
-my_model.export_dagmc_h5m_file(max_mesh_size=1, min_mesh_size=0.5, implicit_complement_material_tag='air')
+my_model.export_dagmc_h5m_file(
+    max_mesh_size=1, min_mesh_size=0.5, implicit_complement_material_tag="air"
+)