diff --git a/src/plugins/knowledge/src/qa_manager.py b/src/plugins/knowledge/src/qa_manager.py
index 6d84dc8e7..a09879a17 100644
--- a/src/plugins/knowledge/src/qa_manager.py
+++ b/src/plugins/knowledge/src/qa_manager.py
@@ -13,6 +13,7 @@ from .utils.dyn_topk import dyn_select_top_k
 
 MAX_KNOWLEDGE_LENGTH = 10000  # 最大知识长度
 
+
 class QAManager:
     def __init__(
         self,