diff --git a/README.md b/README.md
index e4eaaea..4605566 100644
--- a/README.md
+++ b/README.md
@@ -48,7 +48,7 @@ Fortunately ACI allows port 80 without encryption.
 
 ```
 -l  listen address:port (default :8080)
--t  image type gif or png (default git) 
+-t  image type gif or png (default gif) 
 -g  image geometry, WxHxC, height can be 0 for unlimited (default 1152x600x256)
 -h  headless mode, hide browser window on the server (default true)
 -d  chromedp debug logging (default false)