diff --git a/docs/image-preview.md b/docs/image-preview.md
index 6afc53e2..d6fd634a 100644
--- a/docs/image-preview.md
+++ b/docs/image-preview.md
@@ -48,9 +48,10 @@ it will automatically use the "Window system protocol" to display images - this
 
 ## tmux users {#tmux}
 
-To enable Yazi's image preview to work correctly in tmux, add the following 3 options to your `tmux.conf`:
+To enable Yazi's image preview to work correctly in tmux, add the following 4 options to your `tmux.conf`:
 
 ```sh
+set -g default-terminal "tmux-256color"
 set -g allow-passthrough on
 set -ga update-environment TERM
 set -ga update-environment TERM_PROGRAM