We are referring to project labels here.

doc/api/labels.md

@@ -109,7 +109,7 @@ GET /projects/:id/labels/:label_id
 | Attribute     | Type           | Required | Description                                                                                                                                                                  |
 | ---------     | -------        | -------- | ---------------------                                                                                                                                                        |
 | `id`          | integer/string | yes      | The ID or [URL-encoded path of the project](README.md#namespaced-path-encoding) owned by the authenticated user                                                              |
-| `label_id` | integer or string | yes | The ID or title of a group's label. |
+| `label_id` | integer or string | yes | The ID or title of a project's label. |
 | `include_ancestor_groups` | boolean | no | Include ancestor groups. Defaults to `true`. |
 
 ```shell