diff --git a/acme/autocert/example_test.go b/acme/autocert/example_test.go
index 89e2d83..d4225e5 100644
--- a/acme/autocert/example_test.go
+++ b/acme/autocert/example_test.go
@@ -24,7 +24,7 @@ func ExampleManager() {
 	m := &autocert.Manager{
 		Cache:      autocert.DirCache("secret-dir"),
 		Prompt:     autocert.AcceptTOS,
-		HostPolicy: autocert.HostWhitelist("example.org"),
+		HostPolicy: autocert.HostWhitelist("example.org", "www.example.org"),
 	}
 	s := &http.Server{
 		Addr:      ":https",