diff --git a/lib/Graphable.ts b/lib/Graphable.ts
index b6b3442..4450029 100644
--- a/lib/Graphable.ts
+++ b/lib/Graphable.ts
@@ -1,5 +1,5 @@
 import { Graph } from './Graph';
 
 export interface Graphable {
-  to_graph(g: Graph): void;
+  to_graph(g: Graph, ...args: unknown[]): void;
 }