# optional-parameters Definition
**Definition:** Wrap a dynamic segment in double brackets `[[param]]`
to make it optional.
**Syntax:** `src/routes/[[lang]]/home/+page.svelte` matches `/home`
and `/en/home`.
Notes:
- An optional parameter cannot follow a rest parameter (e.g.,
`[...rest]/[[opt]]`).
## Related
- `rest-parameters`, `param-matchers`
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