diff --git a/README.md b/README.md
index f0186b3..73964f8 100644
--- a/README.md
+++ b/README.md
@@ -53,7 +53,8 @@ Android NDK is required to build. [Click for usage information](https://develope
 pmt       android-ndk       other-directories
 ```
 
-The directory structure was thought exactly like this. Be careful.
+ - The directory structure was thought exactly like this. Be careful.
+ - Specify macOS or Linux system usage in config or build command. Default is linux.
 
 If you want to change something, take a look at the configuration. You can change him.
 it is located in the `config` folder. His name is `env.mk`. I gave the information in the file. You can ask more.