diff --git a/Sources/AmiiboService/openapi.yaml b/Sources/AmiiboService/openapi.yaml
index bf6f7d9..11df1ac 100644
--- a/Sources/AmiiboService/openapi.yaml
+++ b/Sources/AmiiboService/openapi.yaml
@@ -229,21 +229,21 @@ paths:
           description: Service is not available.
   /lastupdated:
     get:
-      description: Gets a timestamp when the Amiibo data was last updated.
-      operationId: getLastUpdated
       tags:
         - Service
+      summary: Get the date of last updated.
+      description: |
+        Gets an ISO-formatted date+time when the Amiibo data was last updated.
+
+        Please refer to [the documentation of the endpoint](https://www.amiiboapi.com/docs/#lastUpdated) for further information.
+      operationId: getLastUpdated
       responses:
         '200':
-          description: Successful response returning the object that contains the date and time when the database was last updated.
+          description: Successful response returning an object that contains a date and time when the database was last updated.
           content:
             application/json:
               schema:
                 $ref: '#/components/schemas/LastUpdated'
-        '400':
-          description: A last updated bad request.
-        '404':
-          description: A last updated not found.
         '500':
           description: Service is not available.
 components: