diff --git a/README.md b/README.md
index 65ae05a..146cddf 100644
--- a/README.md
+++ b/README.md
@@ -47,7 +47,7 @@ Note that Cloud Run forces https. Your browser support of encryption protocols a
 ```flags
 -l  listen address:port, default :8080
 -t  image type gif (default) or png, when using PNG number of colors is ignored
--g  image geometry, WxHXC, height can be 0 for unlimited, default 1152x600x256
+-g  image geometry, WxHxC, height can be 0 for unlimited, default 1152x600x256
 -h  headed mode, display browser window on the server
 -d  chromedp debug logging
 -n  do not free maps and gif images after use