diff --git a/openi.py b/openi.py
index 5b2f9bf..7068bc1 100644
--- a/openi.py
+++ b/openi.py
@@ -112,6 +112,7 @@ def c2net_multidataset_to_env(multi_data_url, data_dir):
             filePath = data_dir + "/" + filename
             if not os.path.exists(filePath):
                 os.makedirs(filePath)
+            #If it is a tar compressed package, you can use os.system("tar -xvf {} {}".format(zipfile_path, filePath))
             os.system("unzip {} -d {}".format(zipfile_path, filePath))
 
         except Exception as e: