diff --git a/packages/schema/src/config/postcss.ts b/packages/schema/src/config/postcss.ts
index 2ad0ff1535..db0a1d4304 100644
--- a/packages/schema/src/config/postcss.ts
+++ b/packages/schema/src/config/postcss.ts
@@ -11,6 +11,7 @@ export default {
      * Options for configuring PostCSS plugins.
      *
      * https://postcss.org/
+     * @type {Record<string, any>}
      */
     plugins: {
       /**