# Receiving user input in world system [![](Logo-Tiny.png)](/../../#glossary)
To receive data from marker, you need to get it inside Update method.
> **IMPORTANT!** Do not receive markers inside AdvanceTick, because markers lifetime are limited by current frame.
```csharp
public class UserInputReceiveSystem : ISystem, IUpdate {
    ...
    void IUpdate.Update(in float deltaTime) {
        if (this.world.GetMarker(out WorldClick markerClick) == true) {
            ...
        }
    }
}
```

[![](Footer.png)](/../../#glossary)