diff --git a/model_mgr/manager.py b/model_mgr/manager.py
index 8fed963..266b0e5 100644
--- a/model_mgr/manager.py
+++ b/model_mgr/manager.py
@@ -81,7 +81,7 @@ class ModelManager:
         with self.rlock:
             # 视觉元素tag.id、box.size、table.height无法动态修改，于是我们选择先删除再添加
             if model.obj_type == ModelType.ROBOT:
-                raise ValueError(f'Cannot remove robot model {model.id} {model.name}')
+                raise ValueError(f'Cannot modify robot model {model.id} {model.name}')
             self.remove_model(model.id)
             self.add_model(model)