diff --git a/README.md b/README.md
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--- a/README.md
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@@ -3,3 +3,9 @@ how to spyder cvpr pdf
 
 
 all years about cvpr and iccv papar pdf download code.
+
+
+there are some advantagees:
+1. If you have downloaded a file before the code will skip this file so,you can run this code many times.
+2. You can easily change your save file dir by change the parameter if save_dir.
+3. I use the iteration for download so you don't need to worry the occupitation of memory