diff --git a/src/yubikey_init_master_key.rs b/src/yubikey_init_master_key.rs
index cc1af9e..acd715e 100644
--- a/src/yubikey_init_master_key.rs
+++ b/src/yubikey_init_master_key.rs
@@ -11,7 +11,7 @@ impl Command for CommandImpl {
     fn name(&self) -> &str { "yubikey-init-master-key" }
 
     fn subcommand<'a>(&self) -> App<'a, 'a> {
-        SubCommand::with_name(self.name()).about("Local mini KMS init yubikey")
+        SubCommand::with_name(self.name()).about("Local mini KMS init by Yubikey(HMAC)")
             .arg(Arg::with_name("yubikey-challenge").long("yubikey-challenge").short("c").takes_value(true).help("Yubikey challenge"))
             .arg(Arg::with_name("key-hex").long("key-hex").short("x").takes_value(true).help("Key(hex), for encrypt"))
             .arg(Arg::with_name("key-base64").long("key-base64").short("b").takes_value(true).help("Key(base64), for encrypt"))