---
title: "extendTimeline(for:)"
framework: clockkit
role: symbol
role_heading: Instance Method
path: "clockkit/clkcomplicationserver/extendtimeline(for:)"
---

# extendTimeline(for:)

Asks the system to extend the data in your complication’s timeline.

## Declaration

```swift
func extendTimeline(for complication: CLKComplication)
```

## Parameters

- `complication`: The complication whose data you want to extend.

## Mentioned in

Keeping your complications up to date

## Discussion

Discussion Call this method when your existing complication data is still valid and you’ve new data to add to the end of your timeline. ClockKit initiates an update session to request the additional data from your complication data source. If your complication has already exceeded its allotted daily budget for execution time, calls to this method do nothing.

## See Also

### Updating Your Timeline Data

- [reloadTimeline(for:)](clockkit/clkcomplicationserver/reloadtimeline(for:).md)