cmd/balloon/main.go | 5 +++++

diff --git a/cmd/balloon/main.go b/cmd/balloon/main.go
index 9e329033a739944e827a895775520111dd236c2ed942a1879a366af36a6da570..cb51560bf61808356273e016755326d58f82926fc0d13e7023e3048feacf8713 100644
--- a/cmd/balloon/main.go
+++ b/cmd/balloon/main.go
@@ -25,6 +25,7 @@ 	"encoding/hex"
 	"flag"
 	"fmt"
 	"io"
+	"os"
 
 	"go.cypherpunks.ru/balloon"
 )
@@ -35,6 +36,10 @@ 	t := flag.Int("t", 2, "Time cost, rounds")
 	p := flag.Int("p", 4, "Number of threads")
 	saltHex := flag.String("salt", "", "Salt, hexadecimal, optional")
 	passwd := flag.String("passwd", "", "Password")
+	flag.Usage = func() {
+		fmt.Fprintf(os.Stderr, "balloon -- Strengthen password with Balloon+SHA512\n\n")
+		flag.PrintDefaults()
+	}
 	flag.Parse()
 	var salt []byte
 	var err error