diff --git a/duplicate_checker.py b/duplicate_checker.py
index ffce51c6..394701e3 100644
--- a/duplicate_checker.py
+++ b/duplicate_checker.py
@@ -7,6 +7,8 @@ from thefuzz import fuzz
 from helpers import normalize_company_name, simple_normalize_url
 from google_sheet_handler import GoogleSheetHandler
 
+# duplicate_checker.py v2.1 (mit erweitertem Logging und Datum im Dateinamen)
+# Version: 2025-08-06_12-33
 # --- Konfiguration ---
 CRM_SHEET_NAME = "CRM_Accounts"
 MATCHING_SHEET_NAME = "Matching_Accounts"