diff --git a/litellm/router_strategy/complexity_router/config.py b/litellm/router_strategy/complexity_router/config.py
index 2610fffa117..3b1a4c6b9f0 100644
--- a/litellm/router_strategy/complexity_router/config.py
+++ b/litellm/router_strategy/complexity_router/config.py
@@ -565,7 +565,7 @@ class ComplexityRouterConfig(BaseModel):
         if registered is None:
             raise ValueError(
                 f"{value!r} is not a registered classifier plugin; declare it under "
-                "classifier_plugins in the proxy config"
+                "classifier_plugins in the proxy config (the registry loads at startup and config reload)"
             )
         return registered