diff --git a/batch_generator.rb b/batch_generator.rb
index 2927d3d3a3cf8adda6a4ecf07c23dcecb668b6cd..2abcb33fcbb4b8e65a3d7b2884607e0edc93a573 100644
--- a/batch_generator.rb
+++ b/batch_generator.rb
@@ -3,6 +3,8 @@ require_relative './md_generator'
 class BatchGenerator
 
   def execute
+    rename_docxs
+    
     file_names = Dir.entries('docxs')
     result = {}
 
@@ -23,5 +25,15 @@ class BatchGenerator
 
     p "success: #{result.select{|k, v| v}.keys}"
   end
+
+  def rename_docxs
+    file_names = Dir.entries('docxs')
+    index = 1
+    file_names.each do |file_name|
+      next if file_name.start_with?(".")
+      `mv docxs/#{file_name} docxs/#{index}.docx`
+      index += 1
+    end
+  end
 end
 BatchGenerator.new.execute