update readme

README.MD

@@ -85,7 +85,8 @@ Some JSON workflow files in the    ```workflow``` directory, That's examples of
 
 Chinese domestic users from  [BaiduNetdisk](https://pan.baidu.com/s/1T_uXMX3OKIWOJLPuLijrgA?pwd=1yye)  and other users from [huggingface.co/chflame163/ComfyUI_LayerStyle](https://huggingface.co/chflame163/ComfyUI_LayerStyle/tree/main)  
 download all files and copy them to ```ComfyUI\models``` folder. This link provides all the model files required for this plugin.
-Or download the model file according to the instructions of each node.
+Or download the model file according to the instructions of each node.     
+Some nodes named "Ultra" will use the vitmatte model, download the [vitmatte model](https://huggingface.co/hustvl/vitmatte-small-composition-1k/tree/main) and copy to ```ComfyUI/models/vitmatte``` folder, it is also included in the download link above. 
 
 ## Common Issues
 

README_CN.MD

@@ -73,7 +73,8 @@ git clone https://github.com/chflame163/ComfyUI_LayerStyle.git
 ### 下载模型
 国内用户请从[百度网盘](https://pan.baidu.com/s/1T_uXMX3OKIWOJLPuLijrgA?pwd=1yye), 海外用户请从[huggingface](https://huggingface.co/chflame163/ComfyUI_LayerStyle/tree/main), 
 下载全部模型文件并复制到```ComfyUI\models```文件夹。这个链接提供了本插件需要的所有的模型文件。
-或者按各个节点的说明下载模型文件。
+或者按各个节点的说明下载模型文件。     
+以Ultra命名的节点使用vitmatte模型，请下载[vitmatte模型](https://huggingface.co/hustvl/vitmatte-small-composition-1k/tree/main)到```ComfyUI/models/vitmatte```文件夹，上面的下载链接也包括了这个模型。
 
 ## 常见问题
 如果节点不能正常加载，或者使用中出现错误，请在ComfyUI终端窗口查看报错信息。以下是常见的错误及解决方法。