diff --git a/mmengine/visualization/visualizer.py b/mmengine/visualization/visualizer.py
index 0e4c1b50df..3b31c67727 100644
--- a/mmengine/visualization/visualizer.py
+++ b/mmengine/visualization/visualizer.py
@@ -961,7 +961,7 @@ def draw_featmap(featmap: torch.Tensor,
                 if topk <= 0, tensor_chw is assert to be one or three.
                 Defaults to 20.
             arrangement (Tuple[int, int]): The arrangement of featmap when
-                channel_reduction is not None and topk > 0. Defaults to (4, 5).
+                channel_reduction is None and topk > 0. Defaults to (4, 5).
             resize_shape (tuple, optional): The shape to scale the feature map.
                 Defaults to None.
             alpha (Union[int, List[int]]): The transparency of featmap.