diff --git a/README.md b/README.md
index 940c139..ca0d5e3 100644
--- a/README.md
+++ b/README.md
@@ -30,9 +30,6 @@ $ awsmfa [options] [token-code]
 --serial-number string
 	AWS serial number. `--serial-number` is required
 
---token-code string
-	Device token codes issued by the MFA. `--token-code` option or `token-code` is required
-
 --quiet bool
 	if enabled, log is not printed in the console. (default `false`)
 ```
diff --git a/cmd/awsmfa/main.go b/cmd/awsmfa/main.go
index d6e4855..c9a6fdf 100644
--- a/cmd/awsmfa/main.go
+++ b/cmd/awsmfa/main.go
@@ -41,10 +41,6 @@ func main() {
 				Name:  "serial-number",
 				Usage: "AWS serial-number",
 			},
-			&cli.StringFlag{
-				Name:  "token-code",
-				Usage: "AWS MFA token",
-			},
 			&cli.BoolFlag{
 				Name:  "quiet",
 				Usage: "log print disable",
diff --git a/config.go b/config.go
index baaa405..815ab05 100644
--- a/config.go
+++ b/config.go
@@ -42,12 +42,9 @@ func NewConfig(c *cli.Context) (*Config, error) {
 		return nil, errors.New("--serial-number is required")
 	}
 
-	mfaTokenCode := c.String("token-code")
+	mfaTokenCode := c.Args().First()
 	if mfaTokenCode == "" {
-		mfaTokenCode = c.Args().First()
-	}
-	if mfaTokenCode == "" {
-		return nil, errors.New("--token-code or token arguments is required")
+		return nil, errors.New("[token-code] arguments is required")
 	}
 
 	client := sts.New(session.Must(session.NewSessionWithOptions(session.Options{