diff --git a/main.go b/main.go
index 580b2cb..4991aea 100644
--- a/main.go
+++ b/main.go
@@ -8,6 +8,7 @@ import (
 	"fmt"
 	"log"
 	"os"
+	"path/filepath"
 	"regexp"
 	"sort"
 	"strconv"
@@ -153,6 +154,12 @@ func main() {
 		lastFrame  = flag.Int("lastFrame", 3030, "kanji last frame")
 	)
 
+	flag.Usage = func() {
+		fmt.Fprintf(os.Stderr, "Usage: %s [options] <stories.json> [kanji.txt]\n", filepath.Base(os.Args[0]))
+		fmt.Fprintln(os.Stderr, "Options:")
+		flag.PrintDefaults()
+	}
+
 	flag.Parse()
 
 	args := flag.Args()