diff --git a/aria2update b/aria2update
new file mode 100755
index 0000000..5bdb42d
Binary files /dev/null and b/aria2update differ
diff --git a/go.mod b/go.mod
new file mode 100644
index 0000000..77349b1
--- /dev/null
+++ b/go.mod
@@ -0,0 +1,3 @@
+module aria2update
+
+go 1.14
diff --git a/main.go b/main.go
index 5b263e3..90c363a 100644
--- a/main.go
+++ b/main.go
@@ -3,6 +3,7 @@ package main
 import (
 	"bufio"
 	"flag"
+	"fmt"
 	"net/http"
 	"os"
 	"path/filepath"
@@ -63,6 +64,8 @@ func main() {
 	flag.Parse()
 	if len(flag.Arg(0)) > 0 {
 		listUrl = flag.Arg(0)
+	} else {
+		fmt.Print("Usage:\n\t./aria2-trackers\nOr:\n\t./aria2-trackers [url of list]\n")
 	}
 	list1, err := downloadList()
 	if err != nil {