diff --git a/Dockerfile b/Dockerfile
index 70362a2..92026fd 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -6,11 +6,12 @@ RUN pip3 install --user -r /tmp/requirements.txt && rm /tmp/requirements.txt
 
 
 FROM python:alpine
-RUN apk update && apk add  --no-cache ffmpeg
+RUN apk update && apk add  --no-cache ffmpeg git
 COPY --from=builder /root/.local /usr/local
 COPY --from=builder /etc/ssl/certs/ca-certificates.crt /etc/ssl/certs/
 COPY --from=builder /usr/share/zoneinfo /usr/share/zoneinfo
 COPY . /ytdl-bot
+RUN cd /ytdl-bot && git submodule update --init --recursive && apk del git
 
 WORKDIR /ytdl-bot
 ENV TZ=Asia/Shanghai
diff --git a/README.md b/README.md
index fac25c7..2df028b 100644
--- a/README.md
+++ b/README.md
@@ -9,15 +9,35 @@ Download videos from YouTube and other platforms through a Telegram Bot
 Send link from YouTube directly to the bot. 
 Any platform [supported by youtube-dl](https://ytdl-org.github.io/youtube-dl/supportedsites.html) will also work.
 
+# Feature
+![](assets/1.jpeg)
+
+1. fast download and upload. Many thanks to [FastTelethon](https://gist.github.com/painor/7e74de80ae0c819d3e9abcf9989a8dd6) and 
+[JasonKhew96](https://github.com/JasonKhew96)'s contribution on this!
+2. ads free - I'll never send ads to you, also I don't even print logs that will identify you. 
+   So feel free to download any type of video from any website.
+
+3. support progress bar 
+
 # How to deploy?
 ## Normal
+1. clone code and update submodule `git submodule update --init --recursive`
 1. install Python 3.6+
 2. pip3 install -r requirements.txt
 3. set environment variables `TOKEN`, `APP_ID` and `APP_HASH`
 4. `python3 bot.py`
 5. supervisor on your own preference.
+
 ## docker
 see [here](https://github.com/tgbot-collection/BotsRunner)
 
+# commdands
+```
+start - let's start
+about - wanna contribute?
+ping - bot running status
+help - it's not working?
+ytdl - download video in group
+```
 # License
 Apache License 2.0
diff --git a/assets/1.jpeg b/assets/1.jpeg
new file mode 100644
index 0000000..88334b5
Binary files /dev/null and b/assets/1.jpeg differ
diff --git a/ytdl.py b/ytdl.py
index 06d9d44..dcc43dd 100644
--- a/ytdl.py
+++ b/ytdl.py
@@ -18,15 +18,19 @@ import functools
 
 import fakeredis
 import youtube_dl
-from FastTelethon.FastTelethon import upload_file
+
 from hachoir.metadata import extractMetadata
 from hachoir.parser import createParser
+from hachoir.metadata.video import MkvMetadata
+
 from telethon import TelegramClient, events
 from telethon.tl.types import DocumentAttributeFilename, DocumentAttributeVideo
 from telethon.utils import get_input_media
-from hachoir.metadata.video import MkvMetadata
+
 from tgbot_ping import get_runtime
 
+from FastTelethon.FastTelethon import upload_file
+
 logging.basicConfig(level=logging.INFO, format='%(asctime)s - %(filename)s [%(levelname)s]: %(message)s')
 
 token = os.getenv("TOKEN") or "17Zg"
@@ -141,9 +145,14 @@ async def echo_all(event):
     chat_id = event.message.chat_id
     url = re.sub(r'/ytdl\s*', '', event.message.text)
     logging.info("start %s", url)
+    # if this is in a group/channel
+    if not event.message.is_private and not event.message.text.lower().startswith("/ytdl"):
+        logging.info("%s, it's annoying me...🙄️ ", event.message.text)
+        return
     if not re.findall(r"^https?://", url.lower()):
         await event.reply("I think you should send me a link. Don't you agree with me?")
         return
+
     message = await event.reply("Processing...")
     temp_dir = tempfile.TemporaryDirectory()
 
@@ -172,7 +181,7 @@ async def echo_all(event):
                 ),
                 DocumentAttributeFilename(
                     os.path.basename(video_path)),
-                ]
+            ]
             input_media.mime_type = mime_type
             await bot.send_file(chat_id, input_media)
             await bot.edit_message(chat_id, message, 'Download success!✅')
@@ -193,13 +202,13 @@ def get_metadata(video_path):
                 duration=metadata.get('duration').seconds,
                 w=metadata['video[1]'].get('width'),
                 h=metadata['video[1]'].get('height')
-                ), metadata.get('mime_type')
+            ), metadata.get('mime_type')
         else:
             return dict(
                 duration=metadata.get('duration').seconds,
                 w=metadata.get('width'),
                 h=metadata.get('height')
-                ), metadata.get('mime_type')
+            ), metadata.get('mime_type')
     except Exception as e:
         logging.error(e)
         return dict(duration=0, w=0, h=0), 'application/octet-stream'