diff --git a/User-Menu-Cookbook.md b/User-Menu-Cookbook.md
index eb0f362..2fa12ee 100644
--- a/User-Menu-Cookbook.md
+++ b/User-Menu-Cookbook.md
@@ -48,7 +48,7 @@ module.exports = {
         const mp3Names = names.filter(isMp3);
         
         // create mp3 directory
-        await IO.write(`${mp3Dir}?dir`);
+        await IO.createDirectory(mp3Dir);
         
         // move *.mp3 files to mp3 directory
         await IO.move(dirPath, mp3Dir, mp3Names);