diff --git a/qgepqwat2ili/qgepdss/export.py b/qgepqwat2ili/qgepdss/export.py
index 55d4703c..313beb07 100644
--- a/qgepqwat2ili/qgepdss/export.py
+++ b/qgepqwat2ili/qgepdss/export.py
@@ -114,7 +114,7 @@ def modulo_angle(val):
 
     def check_fk_in_subsetid (subset, relation):
         """
-        checks, whether foreignkey is in the subset_ids - if yes it return the foreignkey, if no it will return NULL
+        checks, whether foreignkey is in the subset_ids - if yes it return the tid of the foreignkey, if no it will return None
         """
         logger.info(f"check_fk_in_subsetid -  Subset ID's '{subset}'")
         # get the value of the fk_ attribute as str out of the relation to be able to check whether it is in the subset