diff --git a/packages/backend-defaults/config.d.ts b/packages/backend-defaults/config.d.ts
index f0632a37bb..6131169d6b 100644
--- a/packages/backend-defaults/config.d.ts
+++ b/packages/backend-defaults/config.d.ts
@@ -993,6 +993,13 @@ export interface Config {
      */
     csp?: { [policyId: string]: string[] | false };
 
+    /**
+     * Referrer Policy options
+     */
+    referrer?: {
+      policy: string[];
+    };
+
     /**
      * Options for the health check service and endpoint.
      */