diff --git a/python/sglang/srt/managers/io_struct.py b/python/sglang/srt/managers/io_struct.py
index 73a7ce0e2..b41d0e3b7 100644
--- a/python/sglang/srt/managers/io_struct.py
+++ b/python/sglang/srt/managers/io_struct.py
@@ -134,7 +134,7 @@ class GenerateReqInput:
     # Conversation id used for tracking requests
     conversation_id: Optional[str] = None
 
-    # Label for the request
+    # (Deprecated, please use custom_labels) Label for the request
     label: Optional[str] = None
 
     # Priority for the request