diff --git a/README-zh.md b/README-zh.md
index c2d4cb37..790d5eaa 100644
--- a/README-zh.md
+++ b/README-zh.md
@@ -823,7 +823,7 @@ rag = LightRAG(
   create INDEX CONCURRENTLY entity_idx_node_id ON dickens."Entity" (ag_catalog.agtype_access_operator(properties, '"node_id"'::agtype));
   CREATE INDEX CONCURRENTLY entity_node_id_gin_idx ON dickens."Entity" using gin(properties);
   ALTER TABLE dickens."DIRECTED" CLUSTER ON directed_sid_idx;
-  
+
   -- 如有必要可以删除
   drop INDEX entity_p_idx;
   drop INDEX vertex_p_idx;
diff --git a/README.md b/README.md
index 36dab6d9..53787c5b 100644
--- a/README.md
+++ b/README.md
@@ -844,7 +844,7 @@ For production level scenarios you will most likely want to leverage an enterpri
   create INDEX CONCURRENTLY entity_idx_node_id ON dickens."Entity" (ag_catalog.agtype_access_operator(properties, '"node_id"'::agtype));
   CREATE INDEX CONCURRENTLY entity_node_id_gin_idx ON dickens."Entity" using gin(properties);
   ALTER TABLE dickens."DIRECTED" CLUSTER ON directed_sid_idx;
-  
+
   -- drop if necessary
   drop INDEX entity_p_idx;
   drop INDEX vertex_p_idx;
diff --git a/lightrag/llm/openai.py b/lightrag/llm/openai.py
index 8a75c87c..68f26e4a 100644
--- a/lightrag/llm/openai.py
+++ b/lightrag/llm/openai.py
@@ -89,7 +89,9 @@ def create_openai_async_client(
     if base_url is not None:
         merged_configs["base_url"] = base_url
     else:
-        merged_configs["base_url"] = os.environ.get("OPENAI_API_BASE", "https://api.openai.com/v1")
+        merged_configs["base_url"] = os.environ.get(
+            "OPENAI_API_BASE", "https://api.openai.com/v1"
+        )
 
     return AsyncOpenAI(**merged_configs)