diff --git a/server/entertainment_decider/models.py b/server/entertainment_decider/models.py
index 7454466..5072981 100644
--- a/server/entertainment_decider/models.py
+++ b/server/entertainment_decider/models.py
@@ -481,8 +481,12 @@ def generate_preference_list(
             break
         element_list.remove(first_element)
         preference = preference.adapt_score(first_element, score_adapt)
+
+    # revert any changes on DB
     orm.rollback()
     db.execute(f"ALTER TABLE {Tag._table_} AUTO_INCREMENT = 1;")
+
+    # return MediaElements
     return [MediaElement[i] for i in res_ids]