diff --git a/packages/frontend-app-api/src/createApp.tsx b/packages/frontend-app-api/src/createApp.tsx
index 200e007758..728610679d 100644
--- a/packages/frontend-app-api/src/createApp.tsx
+++ b/packages/frontend-app-api/src/createApp.tsx
@@ -132,6 +132,7 @@ export function createApp(options: { plugins: BackstagePlugin[] }): {
   };
 }
 
+/** @internal */
 export function extractRouteInfoFromInstanceTree(
   roots: ExtensionInstance[],
 ): Map<RouteRef, string> {