diff --git a/python/seaserv/api.py b/python/seaserv/api.py
index a641fff..66cbc8f 100644
--- a/python/seaserv/api.py
+++ b/python/seaserv/api.py
@@ -233,9 +233,18 @@ class SeafileAPI(object):
         return seafserv_threaded_rpc.put_file(repo_id, tmp_file_path, parent_dir,
                                               filename, username, head_id)
 
+    '''
+    If you want to delete multiple files in a batch, @filename should be in
+    the following format: 'filename1\tfilename2\tfilename3'
+    '''
     def del_file(self, repo_id, parent_dir, filename, username):
         return seafserv_threaded_rpc.del_file(repo_id, parent_dir, filename, username)
 
+    '''
+    If you want to move or copy multiple files in a batch, @src_filename and @dst_filename
+    should be in the following format: 'filename1\tfilename2\tfilename3',make sure the number of files
+    in @src_filename and @dst_filename parameters match
+    '''
     def copy_file(self, src_repo, src_dir, src_filename, dst_repo,
                   dst_dir, dst_filename, username, need_progress, synchronous=0):
         return seafserv_threaded_rpc.copy_file(src_repo, src_dir, src_filename,