diff --git a/pySim/runtime.py b/pySim/runtime.py
index 3ef9b2dd..5a93645c 100644
--- a/pySim/runtime.py
+++ b/pySim/runtime.py
@@ -402,6 +402,7 @@ class RuntimeLchan:
         return self.selected_file.decode_select_response(data)
 
     def get_file_for_selectable(self, name: str):
+        """Get the related CardFile object for a specified filename."""
         sels = self.selected_file.get_selectables()
         return sels[name]