diff --git a/README.md b/README.md
index ef5d76c..e0b866c 100644
--- a/README.md
+++ b/README.md
@@ -32,6 +32,7 @@ API_ID=<If you use MTProto API. Type here API_ID from Telegram API Development T
 API_HASH=<If you use MTProto API. Type here API_HASH from Telegram API Development Tools>
 API_SESSION=<If you use MTProto API. Type here API_SESSION from Session get script (Step 2)>
 CHAT_ID=<If you use MTProto API. ID of chat. You can send new message and chat and use command: curl -s "https://api.telegram.org/bot$BOT_TOKEN/getUpdates" (REPLACE '$BOT_TOKEN' to Your Bot token!!!)>
+EMPTY_IMAGE_URL=<URL to empty preview image (for default using: https://placekitten.com/500/350)>
 ```
 4) Build docker container: `docker build -t ytdlp_node:release .`
 5) Up docker container: `docker run -d --name ytdlp_node --restart unless-stopped --env-file .env -v "$(pwd)/cookies.txt:/app/cookies.txt" ytdlp_node:release`