# Undefined Features In Development

To enable a more streamlined developer experience, we can treat undefined features as Always On, to avoid having to go into Toggly and define the feature. 

Simply add `UndefinedEnabledOnDevelopment` to `AddTogglyWeb`.

```csharp
builder.Services.AddTogglyWeb(options =>
{
    options.AppKey = builder.Configuration["Toggly:AppKey"]!;
    options.Environment = builder.Configuration["Toggly:Environment"]!;
    options.UndefinedEnabledOnDevelopment = true;
});
```

{% hint style="success" %}
Don't worry, we auto-detect new flags being checked, and show you any undefined ones on the Feature Definitions page at the bottom.
{% endhint %}

{% hint style="info" %}
This works with app.Environment.IsDevelopment() to only affect development. For all other environments, you'll still need to define the feature
{% endhint %}


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