diff --git a/masque/file/gdsii.py b/masque/file/gdsii.py
index e859e1f..223c7d7 100644
--- a/masque/file/gdsii.py
+++ b/masque/file/gdsii.py
@@ -1,7 +1,7 @@
 """
 GDSII file format readers and writers
 """
-
+# python-gdsii
 import gdsii.library
 import gdsii.structure
 import gdsii.elements