diff --git a/python/sglang/srt/managers/expert_location_dispatch.py b/python/sglang/srt/managers/expert_location_dispatch.py
index 547dd4e72..92b9095e3 100644
--- a/python/sglang/srt/managers/expert_location_dispatch.py
+++ b/python/sglang/srt/managers/expert_location_dispatch.py
@@ -82,7 +82,7 @@ def topk_ids_logical_to_physical(
         return _topk_ids_logical_to_physical_static(topk_ids, info)
     if info.ep_dispatch_algorithm in ["dynamic", "fake"]:
         return _topk_ids_logical_to_physical_dynamic(topk_ids, info)
-    raise NotImplementedError
+    raise NotImplementedError(f"Unknown algorithm {info.ep_dispatch_algorithm}")
 
 
 def _topk_ids_logical_to_physical_static(