diff --git a/src/docs/sdk/performance/span-data-conventions.mdx b/src/docs/sdk/performance/span-data-conventions.mdx
index cc2abab62b..0043de6325 100644
--- a/src/docs/sdk/performance/span-data-conventions.mdx
+++ b/src/docs/sdk/performance/span-data-conventions.mdx
@@ -52,6 +52,14 @@ Below describes the conventions for the Span interface for the `data` field on t
 | `type`                            | string | The type of the resource that was fetched.  | `xhr`                 |
 | `resource.render_blocking_status` | string | The render blocking status of the resource. | `non-blocking`        |
 
+## UI
+
+| Attribute                         | Type   | Description                                 | Examples              |
+| --------------------------------- | ------ | ------------------------------------------- | --------------------- |
+| `ui.contributes_to_ttid`    | boolean |  Whether the span execution contributed to the TTID (time to initial display) metric.  |   `true`   |
+| `ui.contributes_to_ttfd`    | boolean |  Whether the span execution contributed to the TTFD (time to fully drawn) metric. |   `true`   |
+
+
 ## Database
 
 | Attribute               | Type   | Description                                                                                                                                                                                                                                                                                                                | Examples      |