diff --git a/src/bonsai/bonsai/bim/import_ifc.py b/src/bonsai/bonsai/bim/import_ifc.py
index 02f066d3ee..a9374a3022 100644
--- a/src/bonsai/bonsai/bim/import_ifc.py
+++ b/src/bonsai/bonsai/bim/import_ifc.py
@@ -428,6 +428,7 @@ class IfcImporter:
 
         rep = representation
         while True:
+            # Tekla 2023 has missing items, though it's invalid IFC.
             if rep.Items and len(rep.Items) == 1 and rep.Items[0].is_a("IfcMappedItem"):
                 rep_matrix = ifcopenshell.util.placement.get_mappeditem_transformation(rep.Items[0])
                 if not np.allclose(rep_matrix, np.eye(4)):
diff --git a/src/ifcopenshell-python/ifcopenshell/util/representation.py b/src/ifcopenshell-python/ifcopenshell/util/representation.py
index 53bf307c17..50ce20d044 100644
--- a/src/ifcopenshell-python/ifcopenshell/util/representation.py
+++ b/src/ifcopenshell-python/ifcopenshell/util/representation.py
@@ -294,6 +294,7 @@ def resolve_representation(representation: ifcopenshell.entity_instance) -> ifco
     :param representation: IfcRepresentation
     :return: Representation resolved from mappings
     """
+    # Tekla 2023 has missing items and mapped representation, though it's invalid IFC.
     if (
         len(representation.Items or []) == 1
         and representation.Items[0].is_a("IfcMappedItem")