diff --git a/lightrag/operate.py b/lightrag/operate.py
index 3a7f663e..0d4dc904 100644
--- a/lightrag/operate.py
+++ b/lightrag/operate.py
@@ -601,7 +601,9 @@ async def extract_entities(
         file_path = chunk_dp.get("file_path", "unknown_source")
 
         # Get initial extraction
-        hint_prompt = entity_extract_prompt.format(**{**context_base, "input_text": content})
+        hint_prompt = entity_extract_prompt.format(
+            **{**context_base, "input_text": content}
+        )
 
         final_result = await use_llm_func_with_cache(
             hint_prompt,