Document context parameter of interactive UI

snaps/features/custom-ui/interactive-ui.md

@@ -37,6 +37,13 @@ If you need to [update the interface](#update-an-interactive-interface) or
 [get its state](#get-an-interactive-interfaces-state) at a future time, you should store its ID in
 the Snap's storage.
 
+### Optionally add context to an interface
+
+You can optionally add context to an interface by passing a `context` object to the
+[`snap_createInterface`](../../reference/snaps-api.md#snap_createinterface) method.
+This object is optional and can contain any data you want to pass to the interface.
+This context will be passed to [`onUserInput`](../../reference/entry-points.md#onuserinput) when the user interacts with the interface.
+
 ## Update an interactive interface
 
 To update an interactive interface that is still active, use the

snaps/reference/entry-points.md

@@ -654,6 +654,7 @@ To respond to [interactive UI](../features/custom-ui/interactive-ui.md) events,
   - `name` - The name of the component that fired the event.
     Optional when the event type is `ButtonClickEvent`.
   - `value` - When the event type is `FormSubmitEvent`, the values in the form as an object.
+- `context` - The context object passed to the interface when calling [`snap_createInterface`](./snaps-api.md#snap_createinterface), or `null`.
 
 #### Example
 

snaps/reference/snaps-api.md

@@ -860,6 +860,7 @@ Creates an interactive interface for use in [interactive UI](../features/custom-
 An object containing:
 
 - `ui` - The [custom UI](../features/custom-ui/index.md) to create.
+- `context` (optional) - A custom context object that will be passed to [`onUserInput`](./entry-points.md#onuserinput) when the user interacts with the interface.
 
 #### Returns