diff --git a/04-CustomLibrary/ExtensionPackages/readme.txt b/04-CustomLibrary/ExtensionPackages/readme.txt
new file mode 100644
index 0000000..6e6125a
--- /dev/null
+++ b/04-CustomLibrary/ExtensionPackages/readme.txt
@@ -0,0 +1,4 @@
+# 导入方法：
+# 1、将‘extensionLibrary.pth’文件放到...\Python\Lib\site-packages目录下
+# 2、根据需要将包目录同‘extensionLibrary.pth’文件一同放到...\Python\Lib\site-packages目录下（目前有‘ExtensionLibrary’和‘FileLibrary’）
+# 3、在测试夹中导入此包即可使用扩展功能
\ No newline at end of file