diff --git a/client/src/defs/renderer.ts b/client/src/defs/renderer.ts
index d4d28c0..74e2712 100644
--- a/client/src/defs/renderer.ts
+++ b/client/src/defs/renderer.ts
@@ -15,4 +15,6 @@ export default interface renderer {
     render(): void;
     eject(): void;
     hide?(): void;
+
+    prepare?(): Promise<void>;
 }
\ No newline at end of file