diff --git a/language_learning/2021.12.08_academic_words/download_word_mp3.py b/language_learning/2021.12.08_academic_words/download_word_mp3.py
index 714fffc..52629ef 100644
--- a/language_learning/2021.12.08_academic_words/download_word_mp3.py
+++ b/language_learning/2021.12.08_academic_words/download_word_mp3.py
@@ -1,3 +1,8 @@
+"""
+This code is supported by the website: https://www.guanjihuan.com
+The newest version of this code is on the web page: https://www.guanjihuan.com/archives/18038
+"""
+
 from bs4 import BeautifulSoup
 import re
 import requests
diff --git a/language_learning/2021.12.08_academic_words/play_mp3.py b/language_learning/2021.12.08_academic_words/play_mp3.py
index 5e70ef5..c4d463f 100644
--- a/language_learning/2021.12.08_academic_words/play_mp3.py
+++ b/language_learning/2021.12.08_academic_words/play_mp3.py
@@ -1,3 +1,8 @@
+"""
+This code is supported by the website: https://www.guanjihuan.com
+The newest version of this code is on the web page: https://www.guanjihuan.com/archives/18038
+"""
+
 import pygame
 import time
 import os