diff --git a/python/sglang/srt/managers/io_struct.py b/python/sglang/srt/managers/io_struct.py
index c80b54be5..b1f143b6c 100644
--- a/python/sglang/srt/managers/io_struct.py
+++ b/python/sglang/srt/managers/io_struct.py
@@ -1309,6 +1309,8 @@ class UpdateWeightFromDiskReqInput(BaseReq):
     token_step: int = 0
     # Whether to flush the cache after updating weights
     flush_cache: bool = True
+    # Tensor metadata
+    manifest: Optional[Dict[str, Any]] = None
 
 
 @dataclass