diff --git a/swift-secure-enclave-tool-v2.swift b/swift-secure-enclave-tool-v2.swift
index 3e60a0a..b26691d 100644
--- a/swift-secure-enclave-tool-v2.swift
+++ b/swift-secure-enclave-tool-v2.swift
@@ -558,7 +558,7 @@ if (command == "help" || command == "-h" || command == "--help") {
     print("generate_p256_ecdh_keypair --control-flag <>                   - generate Secure Enclave P256 EC DH key pair")
     print("recover_p256_ecsign_public_key --private-key <>                - recover Secure Enclave P256 EC sign key pair")
     print("recover_p256_ecdh_public_key --private-key <>                  - recover Secure Enclave P256 EC DH key pair")
-    print("compute_p256_ecsign --private-key <> --message-base64 <> [--message-type]  - compure Secure Enclave P256 EC sign")
+    print("compute_p256_ecsign --private-key <> --message-base64 <> [--message-type <>]  - compure Secure Enclave P256 EC sign")
     print("compute_p256_ecdh --private-key <> --ephemera-public-key <>    - compure Secure Enclave P256 EC DH")
     print("external_spec                                                  - external specification")
     print("external_public_key --parameter <>                             - external public key")
@@ -568,6 +568,7 @@ if (command == "help" || command == "-h" || command == "--help") {
     print("> --control-flag           - none, userPresence, devicePasscode, biometryAny, biometryCurrentSet")
     print("> --private-key            - private key representation (dataRepresentationBase64)")
     print("> --message-base64         - content in base64")
+    print("> --message-type           - sha256 or raw(default)")
     print("> --ephemera-public-key    - public key der in base64")
     exit(0)
 }