diff --git a/doc/how-to-use.md b/doc/how-to-use.md
index c9e9009..b1457d0 100644
--- a/doc/how-to-use.md
+++ b/doc/how-to-use.md
@@ -108,23 +108,23 @@
 
    ```
    Usage:
-       navicat-keygen <-bin|-text> [-adv] <RSA-2048 Private Key File>
-
-           <-bin|-text>                  Specify "-bin" to generate "license_file" used by Navicat 11.
-                                         Specify "-text" to generate base64-encoded activation code.
-                                         This parameter must be specified.
-
-           [-adv]                        Enable advance mode.
-                                         This parameter is optional.
-
-           <RSA-2048 Private Key File>   A path to an RSA-2048 private key file.
-                                         This parameter must be specified.
+       navicat-keygen <--bin|-text> [--adv] <RSA-2048 private key file>
+   
+       <--bin|--text>     Specify "--bin" to generate "license_file" used by Navicat 11.
+                          Specify "--text" to generate base64-encoded activation code.
+                          This parameter is mandatory.
+   
+       [--adv]            Enable advance mode.
+                          This parameter is optional.
+   
+       <RSA-2048 private key file>    A path to an RSA-2048 private key file.
+                                      This parameter is mandatory.
    ```
 
    __Example:__
 
    ```bash
-   $ ./navicat-keygen -text ./RegPrivateKey.pem
+   $ ./navicat-keygen --text ./RegPrivateKey.pem
    ```
 
    You will be asked to select Navicat language and give major version number. After that an randomly generated __snKey__ will be given.
diff --git a/doc/how-to-use.zh-CN.md b/doc/how-to-use.zh-CN.md
index 09e3cbc..275ef84 100644
--- a/doc/how-to-use.zh-CN.md
+++ b/doc/how-to-use.zh-CN.md
@@ -108,23 +108,23 @@
 
    ```
    Usage:
-       navicat-keygen <-bin|-text> [-adv] <RSA-2048 Private Key File>
-
-           <-bin|-text>                  Specify "-bin" to generate "license_file" used by Navicat 11.
-                                         Specify "-text" to generate base64-encoded activation code.
-                                         This parameter must be specified.
-
-           [-adv]                        Enable advance mode.
-                                         This parameter is optional.
-
-           <RSA-2048 Private Key File>   A path to an RSA-2048 private key file.
-                                         This parameter must be specified.
+       navicat-keygen <--bin|-text> [--adv] <RSA-2048 private key file>
+   
+       <--bin|--text>     Specify "--bin" to generate "license_file" used by Navicat 11.
+                          Specify "--text" to generate base64-encoded activation code.
+                          This parameter is mandatory.
+   
+       [--adv]            Enable advance mode.
+                          This parameter is optional.
+   
+       <RSA-2048 private key file>    A path to an RSA-2048 private key file.
+                                      This parameter is mandatory.
    ```
 
    __例如：__
 
    ```bash
-   $ ./navicat-keygen -text ./RegPrivateKey.pem
+   $ ./navicat-keygen --text ./RegPrivateKey.pem
    ```
 
    你会被要求选择Navicat产品类别、Navicat语言版本和填写主版本号。之后一个随机生成的 __序列号__ 将会给出。
diff --git a/navicat-keygen/main.cpp b/navicat-keygen/main.cpp
index 2eeb6b6..68ab3f3 100644
--- a/navicat-keygen/main.cpp
+++ b/navicat-keygen/main.cpp
@@ -9,7 +9,7 @@
 #include "navicat_serial_generator.hpp"
 #include "rsa_cipher.hpp"
 
-#define NKG_CURRENT_SOURCE_FILE() u8".\\navicat-keygen\\wmain.cpp"
+#define NKG_CURRENT_SOURCE_FILE() ".\\navicat-keygen\\wmain.cpp"
 #define NKG_CURRENT_SOURCE_LINE() __LINE__
 
 namespace nkg {
@@ -32,20 +32,20 @@ void welcome() {
 
 void help() {
     puts("Usage:");
-    puts("    navicat-keygen.exe <-bin|-text> [-adv] <RSA-2048 Private Key File>");
+    puts("    navicat-keygen <--bin|-text> [--adv] <RSA-2048 private key file>");
     puts("");
-    puts("    <-bin|-text>       Specify \"-bin\" to generate \"license_file\" used by Navicat 11.");
-    puts("                       Specify \"-text\" to generate base64-encoded activation code.");
-    puts("                       This parameter must be specified.");
+    puts("    <--bin|--text>     Specify \"--bin\" to generate \"license_file\" used by Navicat 11.");
+    puts("                       Specify \"--text\" to generate base64-encoded activation code.");
+    puts("                       This parameter is mandatory.");
     puts("");
-    puts("    [-adv]             Enable advance mode.");
+    puts("    [--adv]            Enable advance mode.");
     puts("                       This parameter is optional.");
     puts("");
-    puts("    <RSA-2048 Private Key File>    A path to an RSA-2048 private key file.");
-    puts("                                   This parameter must be specified.");
+    puts("    <RSA-2048 private key file>    A path to an RSA-2048 private key file.");
+    puts("                                   This parameter is mandatory.");
     puts("");
     puts("Example:");
-    puts("    navicat-keygen.exe -text .\\RegPrivateKey.pem");
+    puts("    navicat-keygen --text ./RegPrivateKey.pem");
 }
 
 int main(int argc, char* argv[]) {
@@ -55,24 +55,22 @@ int main(int argc, char* argv[]) {
         nkg::fnCollectInformation lpfnCollectInformation;
         nkg::fnGenerateLicense lpfnGenerateLicense;
 
-        if (strcmp(argv[1], "-bin") == 0) {
+        if (strcmp(argv[1], "--bin") == 0) {
             lpfnGenerateLicense = nkg::GenerateLicenseBinary;
-        } else if (strcmp(argv[1], "-text") == 0) {
+        } else if (strcmp(argv[1], "--text") == 0) {
             lpfnGenerateLicense = nkg::GenerateLicenseText;
         } else {
             help();
             return -1;
         }
 
-        if (argc == 4) {
-            if (strcmp(argv[2], "-adv") == 0) {
-                lpfnCollectInformation = nkg::CollectInformationAdvanced;
-            } else {
-                help();
-                return -1;
-            }
-        } else {
+        if (argc == 3) {
             lpfnCollectInformation = nkg::CollectInformationNormal;
+        } else if (argc == 4 && strcmp(argv[2], "--adv") == 0) {
+            lpfnCollectInformation = nkg::CollectInformationAdvanced;
+        } else {
+            help();
+            return -1;
         }
 
         try {
@@ -80,8 +78,8 @@ int main(int argc, char* argv[]) {
 
             cipher.import_private_key_file(argv[argc - 1]);
             if (cipher.bits() != 2048) {
-                throw nkg::exception(NKG_CURRENT_SOURCE_FILE(), NKG_CURRENT_SOURCE_LINE(), u8"RSA key length mismatches.")
-                    .push_hint(u8"You must provide an RSA key whose modulus length is 2048 bits.");
+                throw nkg::exception(NKG_CURRENT_SOURCE_FILE(), NKG_CURRENT_SOURCE_LINE(), "RSA key length != 2048 bits.")
+                    .push_hint("You must provide an RSA key whose modulus length is 2048 bits.");
             }
 
             auto sn_generator = lpfnCollectInformation();