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-rw-r--r--doc/api/merge_requests.md11
1 files changed, 7 insertions, 4 deletions
diff --git a/doc/api/merge_requests.md b/doc/api/merge_requests.md
index 8217e30fe25..16b892dc3b7 100644
--- a/doc/api/merge_requests.md
+++ b/doc/api/merge_requests.md
@@ -413,11 +413,13 @@ curl -X DELETE -H "PRIVATE-TOKEN: 9koXpg98eAheJpvBs5tK" https://gitlab.example.c
Merge changes submitted with MR using this API.
-If merge success you get `200 OK`.
+If the merge succeeds you'll get a `200 OK`.
-If it has some conflicts and can not be merged - you get 405 and error message 'Branch cannot be merged'
+If it has some conflicts and can not be merged - you'll get a 405 and the error message 'Branch cannot be merged'
-If merge request is already merged or closed - you get 405 and error message 'Method Not Allowed'
+If merge request is already merged or closed - you'll get a 406 and the error message 'Method Not Allowed'
+
+If the `sha` parameter is passed and does not match the HEAD of the source - you'll get a 409 and the error message 'SHA does not match HEAD of source branch'
If you don't have permissions to accept this merge request - you'll get a 401
@@ -431,7 +433,8 @@ Parameters:
- `merge_request_id` (required) - ID of MR
- `merge_commit_message` (optional) - Custom merge commit message
- `should_remove_source_branch` (optional) - if `true` removes the source branch
-- `merged_when_build_succeeds` (optional) - if `true` the MR is merge when the build succeeds
+- `merged_when_build_succeeds` (optional) - if `true` the MR is merged when the build succeeds
+- `sha` (optional) - if present, then this SHA must match the HEAD of the source branch, otherwise the merge will fail
```json
{