diff --git a/swift-secure-enclave-tool.swift b/swift-secure-enclave-tool.swift
index 0eeafe3..80f37d9 100644
--- a/swift-secure-enclave-tool.swift
+++ b/swift-secure-enclave-tool.swift
@@ -149,21 +149,21 @@ if (CommandLine.arguments.count == 1) {
     exitWith("err:require one argument")
 }
 
-let action = CommandLine.arguments[1];
+let command = CommandLine.arguments[1];
 
-if (action == "is_support_secure_enclave") {
+if (command == "is_support_secure_enclave") {
     exitWith("ok:\(isSupportSecureEnclave())")
 }
 
-if (action == "generate_secure_enclave_p256_ecsign_keypair") {
+if (command == "generate_secure_enclave_p256_ecsign_keypair") {
     exitWith(generateSecureEnclaveP256KeyPair(sign: true))
 }
 
-if (action == "generate_secure_enclave_p256_ecdh_keypair") {
+if (command == "generate_secure_enclave_p256_ecdh_keypair") {
     exitWith(generateSecureEnclaveP256KeyPair(sign: false))
 }
 
-if (action == "recover_secure_enclave_p256_ecsign_public_key") {
+if (command == "recover_secure_enclave_p256_ecsign_public_key") {
     if (CommandLine.arguments.count != 3) {
         exitWith("err:require two arguments")
     }
@@ -172,7 +172,7 @@ if (action == "recover_secure_enclave_p256_ecsign_public_key") {
     exitWith(response)
 }
 
-if (action == "recover_secure_enclave_p256_ecdh_public_key") {
+if (command == "recover_secure_enclave_p256_ecdh_public_key") {
     if (CommandLine.arguments.count != 3) {
         exitWith("err:require two arguments")
     }
@@ -181,7 +181,7 @@ if (action == "recover_secure_enclave_p256_ecdh_public_key") {
     exitWith(response)
 }
 
-if (action == "compute_secure_enclave_p256_ecsign") {
+if (command == "compute_secure_enclave_p256_ecsign") {
     if (CommandLine.arguments.count != 4) {
         exitWith("err:require three arguments")
     }
@@ -192,7 +192,7 @@ if (action == "compute_secure_enclave_p256_ecsign") {
     exitWith(response)
 }
 
-if (action == "compute_secure_enclave_p256_ecdh") {
+if (command == "compute_secure_enclave_p256_ecdh") {
     if (CommandLine.arguments.count != 4) {
         exitWith("err:require three arguments")
     }
@@ -203,8 +203,8 @@ if (action == "compute_secure_enclave_p256_ecdh") {
     exitWith(response)
 }
 
-if (action == "version") {
+if (command == "version") {
     exitWith("ok:1.0.0-20250118")
 }
 
-exitWith("err:invalid action")
+exitWith("err:invalid command")