diff --git a/README.md b/README.md
index 47dbde901a8a02..1712e2c49f854a 100644
--- a/README.md
+++ b/README.md
@@ -219,6 +219,24 @@ Or import them from JavaScript:
 import './style.scss'
 ```
 
+#### Passing Options to Pre-Processor
+
+> 0.20.3+
+
+And if you want to pass options to the pre-processor, you can do that using the `cssPreprocessOptions` option in the config (see [Config File](#config-file) below).
+For example, to pass some shared global variables to all your Less styles:
+
+```js
+// vite.config.js
+module.exports = {
+  cssPreprocessOptions: {
+    modifyVars: {
+      'preprocess-custom-color': 'green'
+    }
+  }
+}
+```
+
 ### JSX
 
 `.jsx` and `.tsx` files are also supported. JSX transpilation is also handled via `esbuild`.