diff --git a/docs/tutorials/new_dataset.md b/docs/tutorials/new_dataset.md
index 0ad1019e0e..6118904765 100644
--- a/docs/tutorials/new_dataset.md
+++ b/docs/tutorials/new_dataset.md
@@ -38,6 +38,9 @@ Only
 `data/my_dataset/ann_dir/train/xxx{seg_map_suffix}`,
 `data/my_dataset/ann_dir/train/zzz{seg_map_suffix}` will be loaded.
 
+Note: The annotations are images of shape (H, W), the value pixel should fall in range `[0, num_classes - 1]`.
+You may use `'P'` mode of [pillow](https://pillow.readthedocs.io/en/stable/handbook/concepts.html#palette) to create your annotation image with color.
+
 ## Customize datasets by mixing dataset
 
 MMSegmentation also supports to mix dataset for training.
diff --git a/mmseg/__init__.py b/mmseg/__init__.py
index 11376951e9..abaee58890 100644
--- a/mmseg/__init__.py
+++ b/mmseg/__init__.py
@@ -3,7 +3,7 @@
 from .version import __version__, version_info
 
 MMCV_MIN = '1.0.5'
-MMCV_MAX = '1.0.5'
+MMCV_MAX = '1.1.0'
 
 
 def digit_version(version_str):