[API reference](https://evolu.dev/docs/api-reference) › [@evolu/common](https://evolu.dev/docs/api-reference/common) › [Schedule](https://evolu.dev/docs/api-reference/common/Schedule) › addDelay

```ts
function addDelay(
  extra: Duration,
): <Output, Input>(
  schedule: Schedule<Output, Input>,
) => Schedule<Output, Input>;
```

Defined in: [packages/common/src/Schedule.ts:1018](https://github.com/evoluhq/evolu/blob/037c390af081e9944d616ff298a729515c5c5ab7/packages/common/src/Schedule.ts#L1018)

Adds a fixed delay to the schedule's existing delay.

### Adding to every delay

```ts

// Add 500ms to every exponential delay.
const step = addDelay("500ms")(exponential("100ms"))(testCreateDeps());
assertOk(step(undefined), [100, 600]);
```