diff --git a/deno-src/lib.ts b/deno-src/lib.ts
index 2816960..c9c2838 100644
--- a/deno-src/lib.ts
+++ b/deno-src/lib.ts
@@ -125,7 +125,9 @@ export class YouTubeDownloader implements API {
 
     const videoStream = ytdl(url, { format: videoFormat });
     const audioStream = ytdl(url, { format: audioFormat });
-
+    videoStream.once("readable", () => {
+      startCallback?.();
+    });
     videoStream.on("progress", (_, downloaded, total) => {
       videoDownloaded += downloaded;
       const now = Date.now();
diff --git a/jsr.json b/jsr.json
index 6e03517..709e8b5 100644
--- a/jsr.json
+++ b/jsr.json
@@ -1,6 +1,6 @@
 {
   "name": "@kunkun/kunkun-ext-youtube-downloader",
-  "version": "0.1.1",
+  "version": "0.1.2",
   "license": "MIT",
   "exports": "./mod.ts",
   "imports": {
diff --git a/package.json b/package.json
index 0603fa1..bf44f08 100644
--- a/package.json
+++ b/package.json
@@ -1,7 +1,7 @@
 {
   "$schema": "https://schema.kunkun.sh",
   "name": "kunkun-ext-youtube-dowloader",
-  "version": "0.1.1",
+  "version": "0.1.2",
   "license": "MIT",
   "type": "module",
   "kunkun": {
diff --git a/src/index.ts b/src/index.ts
index eb36809..576e09e 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -180,7 +180,7 @@ class DownloadYouTubeExtension extends WorkerExtension {
     }
 
     let url = await clipboard.readText();
-    // url = "https://youtu.be/-b1FogYHTZc"; // for development only
+    url = "https://youtu.be/-b1FogYHTZc"; // for development only
     // check if url is a valid youtube url
     if (!url.includes("youtube.com") && !url.includes("youtu.be")) {
       toast.warning("Invalid YouTube URL from clipboard");
@@ -189,8 +189,10 @@ class DownloadYouTubeExtension extends WorkerExtension {
     const formats = await this.rpc.api.getAvailableResolutions(url);
     const form = new Form.Form({
       title: "Download YouTube Video",
-      description: "Please copy a YouTube URL then enter this extension.",
-      key: "form1",
+      description: `Please copy a YouTube URL then enter this extension. 
+      High Resolution video (e.g. 4K) could take a very long time to download, please be patient. 
+      A progress bar with estimated time isn't implemented yet. There is a loading bar on the top.`,
+      key: "download-youtube-video",
       showFormDataDebug: true,
       submitBtnText: "Download",
       fields: [