diff --git a/README.md b/README.md
index 8e2c701..424015f 100644
--- a/README.md
+++ b/README.md
@@ -52,11 +52,16 @@ Create the operator via the following factory method
 
 ​	***model_name***: *str*
 
-​	The model name in string.
-If no model name is given, it will use the default value "resnet34".
+​	The model name in string. The default value is "resnet34".
 Refer [Timm Docs](https://fastai.github.io/timmdocs/#List-Models-with-Pretrained-Weights) to get a full list of supported models.
 
-skip_preprocess (bool): 
+
+​	***num_classes***: *1000*
+
+​	The number of classes. The default value is 1000.
+It is related to model and dataset.
+
+​   ***skip_preprocess***: *bool*
 Flag to control whether to skip image preprocess, defaults to False.
 If set to True, image preprocess steps such as transform, normalization will be skipped.
 In this case, the user should guarantee that all the input images are already reprocessed properly, and thus can be fed to model directly.
diff --git a/__init__.py b/__init__.py
index 74e6454..5759c95 100644
--- a/__init__.py
+++ b/__init__.py
@@ -14,5 +14,6 @@
 
 from .timm_image import TimmImage
 
+
 def timm(**kwargs):
     return TimmImage(**kwargs)