diff --git a/mlair/run_modules/pre_processing.py b/mlair/run_modules/pre_processing.py
index 75c63202fca72c55c91e0bd21f5480a971d9cf76..5cf676dd3acfaec5532d006e6de0b22e769db873 100644
--- a/mlair/run_modules/pre_processing.py
+++ b/mlair/run_modules/pre_processing.py
@@ -313,7 +313,8 @@ class PreProcessing(RunEnvironment):
     def store_data_handler_attributes(self, data_handler, collection):
         store_attributes = data_handler.store_attributes()
         if len(store_attributes) > 0:
-            logging.info(f"store following parameters requested by the data handler: {','.join(store_attributes)}")
+            logging.info(f"store following parameters ({len(store_attributes)}) requested by the data handler: "
+                         f"{','.join(store_attributes)}")
             attrs = {}
             for dh in collection:
                 station = str(dh)