diff --git a/backend/app/main.py b/backend/app/main.py
index 2f84539..a950f93 100644
--- a/backend/app/main.py
+++ b/backend/app/main.py
@@ -538,7 +538,7 @@ async def health_check():
 
 @app.websocket("/ws/{client_id}")
 async def websocket_endpoint(websocket: WebSocket, client_id: str):
-    \"\"\"WebSocket 연결 엔드포인트.
+    """WebSocket 연결 엔드포인트.
 
     클라이언트→서버 지원 프로토콜:
       {"type": "ping"}                                       → {"type": "pong"}
@@ -548,7 +548,7 @@ async def websocket_endpoint(websocket: WebSocket, client_id: str):
       {"type": "get_chart", "stock_code": "...", "period": "D", "limit": 200}
                                                             → {"type": "chart_data", ...}
       그 외 메시지                                           → echo
-    \"\"\"
+    """
     await websocket_manager.connect(websocket, client_id)
     try:
         while True: