diff --git a/index.ts b/index.ts
index b9164a1..5177f25 100644
--- a/index.ts
+++ b/index.ts
@@ -183,6 +183,7 @@ app.ws('/download/:id', async (ws, req) => {
       return ws.close()
     }
 
+    ws.send(`VIDEOSIZE-${videoSizeTotal}`)
     audioOutputStream = createOutputStream(req.params.id, selectedFormats.audioFormat.mimeType!);
     videoOutputStream = createOutputStream(req.params.id, selectedFormats.videoFormat.mimeType!);