diff --git a/openapi.yaml b/openapi.yaml
index 2cdb8806..a6be9e19 100644
--- a/openapi.yaml
+++ b/openapi.yaml
@@ -5666,14 +5666,14 @@ components:
       format: date-time
       description: >-
         Date and time of creation (for batch jobs: the status 'created' was set),
-        formatted as a [RFC 3339](https://www.rfc-editor.org/rfc/rfc3339.html) date-time.
+        formatted as an [RFC 3339](https://www.rfc-editor.org/rfc/rfc3339.html) date-time.
       example: '2017-01-01T09:32:12Z'
     updated:
       type: string
       format: date-time
       description: >-
         Date and time of the last status change,
-        formatted as a [RFC 3339](https://www.rfc-editor.org/rfc/rfc3339.html) date-time.
+        formatted as an [RFC 3339](https://www.rfc-editor.org/rfc/rfc3339.html) date-time.
         If the status is `error`, `canceled` or `finished`,
         this is the time when the job has ended.
       example: '2017-01-01T09:36:18Z'
@@ -5696,7 +5696,7 @@ components:
       format: date-time
       description: >-
         Time until which the assets are accessible, in UTC. Formatted as
-        a [RFC 3339](https://www.rfc-editor.org/rfc/rfc3339.html) date-time.
+        an [RFC 3339](https://www.rfc-editor.org/rfc/rfc3339.html) date-time.
       example: '2020-11-01T00:00:00Z'
     description:
       type: string