Update README.md

Author: ovchynnikov

README.md

@@ -142,8 +142,10 @@ Example:
 - Full list of supported sites here: [yt-dlp Supported Sites](https://github.com/yt-dlp/yt-dlp/blob/master/supportedsites.md)
 
 ### The bot can use 'white lists' to restrict access for users or groups.
-- Make sure you have these variables in your .env file either not set or with relatives id's.
-- You can find chat_id or user_id by setting LIMIT_BOT_ACCESS=True first, send a link and the bot will answer you with the IDs. 
+- Make sure you have these variables in your `.env` file either not set or with relatives id's.
+- You can find chat_id or user_id by setting LIMIT_BOT_ACCESS=True first, send a link and the bot will answer you with the IDs.
+- Group Chat has more priority. Users in the Group Chat can use the bot but have no access to the bot privately.
+- When `LIMIT_BOT_ACCESS=True` to use the bot in private messages add user's ID to `ALLOWED_USERNAMES` variable
 ```
 LIMIT_BOT_ACCESS=False  --- If True, the bot will only work for users in ALLOWED_USERNAMES or ALLOWED_CHAT_IDS
 ALLOWED_USERNAMES=  --- list of allowed usernames as strings separated by commas