diff --git a/OTPService.GenerateCode.md b/OTPService.GenerateCode.md
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+Namespace: `SimpleOTP`
+
+Assembly: `SimpleOTP.dll`
+
+## Overloads
+| Overload | Description |
+| --- | --- |
+| [GenerateCode(ref OTPConfiguration)](#GenerateCoderef-OTPConfiguration) | Generates a new OTP code with provided configuration. |
+| [GenerateCode(ref OTPConfiguration, DateTime)](#GenerateCoderef-OTPConfiguration-DateTime) | Generates a new TOTP code with provided configuration and for specific interval. |
+
+## GenerateCode(ref OTPConfiguration)
+Generates a new OTP code with provided configuration.
+```csharp
+public static OTPCode GenerateCode(ref OTPConfiguration target);
+```
+### Parameters
+`target` [OTPConfiguration](https://github.com/XFox111/SimpleOTP/wiki/OTPConfiguration)
+
+OTP configuration object.
+### Exceptions
+[NullReferenceException](https://docs.microsoft.com/en-us/dotnet/api/system.nullreferenceexception?view=net-5.0)
+
+`target` is `null`
+### Examples
+See `OTPService` usage examples on [Code generation/validation](https://github.com/XFox111/SimpleOTP/wiki/Code-generation-or-validation)
+### Remarks
+If you're using HOTP algorithm, save `target` after calling the function.
+
+If OTP algorithm is HOTP, `target` counter is increased by 1.
+
+---
+
+## GenerateCode(ref OTPConfiguration, DateTime)
+Generates a new OTP code with provided configuration.
+```csharp
+public static OTPCode GenerateCode(ref OTPConfiguration target, DateTime date);
+```
+### Parameters
+`target` [OTPConfiguration](https://github.com/XFox111/SimpleOTP/wiki/OTPConfiguration)
+
+OTP configuration object.
+
+`date` [DateTime](https://docs.microsoft.com/en-us/dotnet/api/system.datetime?view=net-5.0)
+
+`DateTime` for which the OTP should be generated.
+### Returns
+[OTPCode](https://github.com/XFox111/SimpleOTP/wiki/OTPCode) instance with generated code.
+### Exceptions
+[NullReferenceException](https://docs.microsoft.com/en-us/dotnet/api/system.nullreferenceexception?view=net-5.0)
+
+`target` is `null`
+### Examples
+See `OTPService` usage examples on [Code generation/validation](https://github.com/XFox111/SimpleOTP/wiki/Code-generation-or-validation)
+### Remarks
+If you're using HOTP algorithm, save `target` after calling the function.
+
+If you're using HOTP algorithm, `date` will be ignored.
+
+If OTP algorithm is HOTP, `target` counter is increased by 1.
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