Update README.md

README.md

@@ -72,8 +72,12 @@ Here is an example if you want to make own dataset.
       └─📁 val/
 </pre>
 
-
-   You can download our training set and validation set [here](http://61.155.111.202:18080/cvrp).
+   If you have annotations in RGB format, you need 
+   ```bash
+   python run/rgb2gray.py
+   ```
+   and then follow split the train set and evaluation set according to the format in ③.
+   You can also download our training set and validation set [here](http://61.155.111.202:18080/cvrp).
 
 2. ***Dataset Configs***