diff --git a/tests/test_transport.py b/tests/test_transport.py
index 0a145e9b..d7389112 100644
--- a/tests/test_transport.py
+++ b/tests/test_transport.py
@@ -24,6 +24,9 @@
 step_files = list(path_to_cad.rglob("*.stp")) + list(path_to_cad.rglob("*.step"))
 
 # these step files all produced failures, most of them lose particles
+# they are removed from the tests but an issue has be raised and a minimal
+# example has been made in the issue where the fixing of these files can be
+# tracked https://github.com/shimwell/GEOUNED/issues/11
 step_files.remove(Path("testing/inputSTEP/large/SCDR.stp"))
 step_files.remove(Path("testing/inputSTEP/placa.stp"))
 step_files.remove(Path("testing/inputSTEP/placa2.stp"))