diff --git a/examples/classic/docusaurus.config.js b/examples/classic/docusaurus.config.js
index 2b8cdb8e866e..d6d2a62a94a9 100644
--- a/examples/classic/docusaurus.config.js
+++ b/examples/classic/docusaurus.config.js
@@ -13,6 +13,11 @@ const config = {
   title: 'My Site',
   tagline: 'Dinosaurs are cool',
   favicon: 'img/favicon.ico',
+  siteConfig: {
+      markdown: {
+        onUnusedDirective: 'throw'
+      }
+  },
 
   // Set the production url of your site here
   url: 'https://your-docusaurus-site.example.com',
diff --git a/packages/docusaurus-types/src/config.d.ts b/packages/docusaurus-types/src/config.d.ts
index 26b7022cf3d9..34ca4f034098 100644
--- a/packages/docusaurus-types/src/config.d.ts
+++ b/packages/docusaurus-types/src/config.d.ts
@@ -19,6 +19,10 @@ export type ReportingSeverity = 'ignore' | 'log' | 'warn' | 'throw';
 
 export type RouterType = 'browser' | 'hash';
 
+export type SiteConfig = {
+  markdown: {onUnusedDirective: 'throw'};
+};
+
 export type ThemeConfig = {
   [key: string]: unknown;
 };
@@ -316,6 +320,16 @@ export type DocusaurusConfig = {
    * @default {}
    */
   themeConfig: ThemeConfig;
+  /**
+   * The [site configuration](https://docusaurus.io/docs/api/docusaurus-config)
+   * object to customize your site configuration like markdown. For example: throw error
+   * if any unused markdown directive is found.
+   *
+   * @see https://docusaurus.io/docs/api/docusaurus-config#siteConfig
+   * @default {}
+   */
+  // TODO: Docs to be added for this
+  siteConfig: SiteConfig;
   /**
    * List of plugins.
    *
diff --git a/packages/docusaurus-types/src/index.d.ts b/packages/docusaurus-types/src/index.d.ts
index a6cb0b00b483..0bb8ecaca6aa 100644
--- a/packages/docusaurus-types/src/index.d.ts
+++ b/packages/docusaurus-types/src/index.d.ts
@@ -17,6 +17,7 @@ export {
   FasterConfig,
   StorageConfig,
   Config,
+  SiteConfig,
 } from './config';
 
 export {