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@@ -182,3 +182,17 @@ Watch a walkthrough of this feature in details in the video below.
<figure class="video-container">
<iframe src="https://www.youtube.com/embed/NmdWRGT8kZg" frameborder="0" allowfullscreen="true"> </iframe>
</figure>
+
+## External pipeline validation service
+
+The [external CI/CD pipeline validation service](../../administration/external_pipeline_validation.md)
+is available for use on self-managed GitLab instances, but is not in use on GitLab.com.
+It is configured with [environment variables](../../administration/environment_variables.md)
+on the instance.
+
+To enable the feature on GitLab.com, enable the `ci_external_validation_service`
+[feature flag](../feature_flags/index.md). The valid "Not accepted" response code
+for GitLab.com is `406` only.
+
+For more details, see the linked issues and MRs in the
+[feature flag rollout issue](https://gitlab.com/gitlab-org/gitlab/-/issues/325982).