diff --git a/docs/config/index.md b/docs/config/index.md
index e10422b5c36b..a868895c87a7 100644
--- a/docs/config/index.md
+++ b/docs/config/index.md
@@ -51,6 +51,20 @@ export default defineConfig({
 })
 ```
 
+When using a separate `vitest.config.js`, you can also extend Vite's options from another config file if needed:
+
+```ts
+import { mergeConfig } from 'vite'
+import { defineConfig } from 'vitest/config'
+import viteConfig from './vite.config'
+
+export default mergeConfig(viteConfig, defineConfig({
+  test: {
+    exclude: ['packages/template/*'],
+  },
+}))
+```
+
 ## Options
 
 :::tip