diff --git a/youtube/youtube-worker/README.md b/youtube/youtube-worker/README.md
index 0d19082..ea8e363 100644
--- a/youtube/youtube-worker/README.md
+++ b/youtube/youtube-worker/README.md
@@ -26,6 +26,8 @@ redis:
   restart: always
 ```
 
+> [format-selection](https://github.com/rg3/youtube-dl#format-selection).
+
 ## server
 
 ```