diff --git a/xapian_backend.py b/xapian_backend.py
index f4b740f..6ca7d51 100755
--- a/xapian_backend.py
+++ b/xapian_backend.py
@@ -1,3 +1,5 @@
+# This file was modified by Matthias Portzel on Dec 22nd, 2021 and Aug 5th, 2022
+
 import datetime
 import pickle
 from pathlib import Path