diff --git a/readme.md b/readme.md
index 279af29..a008d1e 100644
--- a/readme.md
+++ b/readme.md
@@ -19,6 +19,7 @@ func main() {
 	html.RenderIndent(
 		os.Stdout,
 		html.Indent(),
+		Doctype("html"),
 		Html(
 			Head(Title("Hello, world!")),
 			Body(