diff --git a/doc/ci/variables/predefined_variables.md b/doc/ci/variables/predefined_variables.md
index e25425b01ae..678ac285176 100644
--- a/doc/ci/variables/predefined_variables.md
+++ b/doc/ci/variables/predefined_variables.md
@@ -79,6 +79,7 @@ future GitLab releases.**
 | `CI_MERGE_REQUEST_TARGET_BRANCH_NAME`         | 11.6   | all    | The target branch name of the merge request if [the pipelines are for merge requests](../merge_request_pipelines/index.md). Available only if `only: [merge_requests]` is used and the merge request is created.                                                                                                                                           |
 | `CI_MERGE_REQUEST_TARGET_BRANCH_SHA`          | 11.9   | all    | The HEAD SHA of the target branch of the merge request if [the pipelines are for merge requests](../merge_request_pipelines/index.md). Available only if `only: [merge_requests]` is used, the merge request is created, and the pipeline is a [merged result pipeline](../merge_request_pipelines/pipelines_for_merged_results/index.md). **(PREMIUM)**   |
 | `CI_MERGE_REQUEST_TITLE`                      | 11.9   | all    | The title of the merge request if [the pipelines are for merge requests](../merge_request_pipelines/index.md). Available only if `only: [merge_requests]` is used and the merge request is created.                                                                                                                                                        |
+| `CI_MERGE_REQUEST_EVENT_TYPE`                 | 12.3   | all    | The event type of the merge request, if [the pipelines are for merge requests](../merge_request_pipelines/index.md). Can be `detached`, `merged_result` or `merge_train`. |
 | `CI_NODE_INDEX`                               | 11.5   | all    | Index of the job in the job set. If the job is not parallelized, this variable is not set.                                                                                                                                                                                                                                                                 |
 | `CI_NODE_TOTAL`                               | 11.5   | all    | Total number of instances of this job running in parallel. If the job is not parallelized, this variable is set to `1`.                                                                                                                                                                                                                                    |
 | `CI_PAGES_DOMAIN`                             | 11.8   | all    | The configured domain that hosts GitLab Pages.                                                                                                                                                                                                                                                                                                             |
diff --git a/doc/topics/autodevops/index.md b/doc/topics/autodevops/index.md
index 33b13935de3..db622beb253 100644
--- a/doc/topics/autodevops/index.md
+++ b/doc/topics/autodevops/index.md
@@ -19,12 +19,20 @@ For an introduction to Auto DevOps, watch [AutoDevOps in GitLab 11.0](https://yo
 
 ## Enabled by default
 
-Starting with GitLab 11.3, the Auto DevOps pipeline is enabled by default for all
-projects. If it has not been explicitly enabled for the project, Auto DevOps will be automatically
-disabled on the first pipeline failure. Your project will continue to use an alternative
-[CI/CD configuration file](../../ci/yaml/README.md) if one is found. A GitLab
-administrator can [change this setting](../../user/admin_area/settings/continuous_integration.md#auto-devops-core-only)
-in the admin area.
+> [Introduced](https://gitlab.com/gitlab-org/gitlab-foss/issues/41729) in GitLab 11.3.
+
+Auto DevOps is enabled by default for all projects and will attempt to run on all pipelines
+in each project. This default can be enabled or disabled by an instance administrator in the
+[Auto DevOps settings](../../user/admin_area/settings/continuous_integration.md#auto-devops-core-only).
+It will be automatically disabled in individual projects on their first pipeline failure,
+if it has not been explicitly enabled for the project.
+
+Since [GitLab 12.7](https://gitlab.com/gitlab-org/gitlab/issues/26655), Auto DevOps
+will run on pipelines automatically only if a [`Dockerfile` or matching buildpack](#auto-build)
+exists.
+
+If a [CI/CD configuration file](../../ci/yaml/README.md) is present in the project,
+it will continue to be used, whether or not Auto DevOps is enabled.
 
 ## Quick start