diff --git a/api/services/entities/knowledge_entities/rag_pipeline_entities.py b/api/services/entities/knowledge_entities/rag_pipeline_entities.py
index defd3cdd71..041ae4edba 100644
--- a/api/services/entities/knowledge_entities/rag_pipeline_entities.py
+++ b/api/services/entities/knowledge_entities/rag_pipeline_entities.py
@@ -116,6 +116,7 @@ class KnowledgeConfiguration(BaseModel):
     embedding_model: str = ""
     keyword_number: int | None = 10
     retrieval_model: RetrievalSetting
+    # add summary index setting
     summary_index_setting: dict | None = None
 
     @field_validator("embedding_model_provider", mode="before")