diff --git a/walker.d.ts b/walker.d.ts
index c8fceed..892ee30 100644
--- a/walker.d.ts
+++ b/walker.d.ts
@@ -1,7 +1,7 @@
 export default async function htmlStreamWalker(
   streamReader: ReadableStreamDefaultReader<Uint8Array>,
-): {
+): Promise<{
   rootNode: Node | null;
-  firstChild: (node: Node) => Node | null;
-  nextSibling: (node: Node) => Node | null;
-}
\ No newline at end of file
+  firstChild: (node: Node) => Promise<Node | null>;
+  nextSibling: (node: Node) => Promise<Node | null>;
+}>