diff --git a/cmd/stepd/main.go b/cmd/stepd/main.go
index bb2acf2..09d39fb 100644
--- a/cmd/stepd/main.go
+++ b/cmd/stepd/main.go
@@ -31,6 +31,7 @@ func main () {
 	cmd := cli.New (
 		"Run an HTTP server that automaticaly executes STEP files",
 		flagAddress,
+		flagErrorDocument,
 		flagDirectories,
 		cli.NewHelp())
 	cmd.ParseOrExit(os.Args)