diff --git a/readme.md b/readme.md
index 212ea6a..fc901c3 100644
--- a/readme.md
+++ b/readme.md
@@ -240,7 +240,8 @@ const { addLessLoader } = require("customize-cra");
 module.exports = override(
   addLessLoader({
     strictMath: true,
-    noIeCompat: true
+    noIeCompat: true,
+    localIdentName: '[local]--[hash:base64:5]' // if you use CSS Modules, and custom `localIdentName`, default is '[local]--[hash:base64:5]'.
   })
 );
 ```
@@ -249,6 +250,8 @@ Check [Less document](http://lesscss.org/usage/#command-line-usage-options) for
 
 Once `less-loader` is enabled, you can import `.less` file in your project.
 
+`.module.less` will use CSS Modules.
+
 ### disableChunk
 
 Prevents the default static chunking, and forces the entire build into one file. See [this thread](https://github.com/facebook/create-react-app/issues/5306) for more info.