diff --git a/lightrag/operate.py b/lightrag/operate.py
index 1eac8357..de29cf11 100644
--- a/lightrag/operate.py
+++ b/lightrag/operate.py
@@ -1284,7 +1284,7 @@ async def merge_nodes_and_edges(
                             "content": f"{edge_data['src_id']}\t{edge_data['tgt_id']}\n{edge_data['keywords']}\n{edge_data['description']}",
                             "source_id": edge_data["source_id"],
                             "file_path": edge_data.get("file_path", "unknown_source"),
-                            "weight": 0
+                            "weight": 0,
                         }
                     }
                     await relationships_vdb.upsert(data_for_vdb)