diff --git a/packages/frontend-app-api/src/wiring/createExtensionInstance.ts b/packages/frontend-app-api/src/wiring/createExtensionInstance.ts
index 0823f4e6e0..52afe95121 100644
--- a/packages/frontend-app-api/src/wiring/createExtensionInstance.ts
+++ b/packages/frontend-app-api/src/wiring/createExtensionInstance.ts
@@ -21,7 +21,7 @@ import {
 } from '@backstage/frontend-plugin-api';
 import mapValues from 'lodash/mapValues';
 
-/** @public */
+/** @internal */
 export interface ExtensionInstance {
   readonly $$type: '@backstage/ExtensionInstance';