diff --git a/cyborg/api/rest_api_version_history.rst b/cyborg/api/rest_api_version_history.rst
index 7b56abd0..89b99d78 100644
--- a/cyborg/api/rest_api_version_history.rst
+++ b/cyborg/api/rest_api_version_history.rst
@@ -6,6 +6,15 @@ microversion change. The description for each version should be a
 verbose one which has enough information to be suitable for use in
 user documentation.
 
+A user can specify a header in the API request::
+
+  OpenStack-API-Version: accelerator <microversion>
+
+where ``<microversion>`` is any valid api microversion for this API.
+
+If no version is specified then the API will behave as if a version
+request of v2.0 was requested.
+
 2.0
 ---
 
@@ -15,13 +24,6 @@ microversions.
 2.1
 ---
 
-Add ``project_id`` for arq.
+Add ``project_id`` for Accelerator Requests PATCH API. ``project_id`` is
+used to control the operation of arq with different roles.
 
-A user can specify a header in the API request::
-
-  OpenStack-API-Version: accelerator <microversion>
-
-where ``<microversion>`` is any valid api microversion for this API.
-
-If no version is specified then the API will behave as if a version
-request of v2.0 was requested.
diff --git a/releasenotes/notes/add-project_id-to-arq-patch-api-8270cbb26c68af46.yaml b/releasenotes/notes/add-project_id-to-arq-patch-api-8270cbb26c68af46.yaml
new file mode 100644
index 00000000..f7baf094
--- /dev/null
+++ b/releasenotes/notes/add-project_id-to-arq-patch-api-8270cbb26c68af46.yaml
@@ -0,0 +1,8 @@
+---
+features:
+  - |
+    Add ``project_id`` for Accelerator Requests (arq) `PATCH API`_ from
+    microversion 2.1 in order to control operations of accelerator requests
+    with different roles.
+
+    .. _`PATCH API`: https://docs.openstack.org/api-ref/accelerator/v2/index.html#update-accelerator-requests