diff --git a/api-ref/source/v2/parameters.yaml b/api-ref/source/v2/parameters.yaml
index 843dec23800..fcf58f063ca 100644
--- a/api-ref/source/v2/parameters.yaml
+++ b/api-ref/source/v2/parameters.yaml
@@ -293,6 +293,12 @@ backup:
   in: body
   required: true
   type: object
+backup_gigabytes:
+  description: |
+    The size (GB) of backups that are allowed for each project.
+  in: body
+  required: true
+  type: integer
 backup_service:
   description: |
     The service used to perform the backup.
@@ -1265,6 +1271,13 @@ os-vol-tenant-attr:tenant_id:
   in: body
   required: true
   type: string
+per_volume_gigabytes:
+  description: |
+    The size (GB) of volumes in request that are allowed for each
+    volume.
+  in: body
+  required: true
+  type: integer
 perVolumeGigabytes:
   description: |
     The maximum amount of storage per volume, in gibibytes (GiB).
diff --git a/api-ref/source/v2/quota-sets.inc b/api-ref/source/v2/quota-sets.inc
index 1e65480ac37..c49417d5369 100644
--- a/api-ref/source/v2/quota-sets.inc
+++ b/api-ref/source/v2/quota-sets.inc
@@ -98,6 +98,8 @@ Request
    - security_groups: security_groups
    - project_id: quotas_project_id
    - admin_project_id: admin_project_id
+   - backup_gigabytes: backup_gigabytes
+   - per_volume_gigabytes: per_volume_gigabytes
 
 Request Example
 ---------------