diff --git a/api-ref/source/v3/parameters.yaml b/api-ref/source/v3/parameters.yaml
index 09da9e397c..237a0f82ba 100644
--- a/api-ref/source/v3/parameters.yaml
+++ b/api-ref/source/v3/parameters.yaml
@@ -1299,6 +1299,12 @@ role_assignments:
   in: body
   required: true
   type: array
+role_domain_id_request_body:
+  description: |
+    The ID of the domain of the role.
+  in: body
+  required: false
+  type: string
 role_id_response_body:
   description: |
     The role ID.
diff --git a/api-ref/source/v3/roles.inc b/api-ref/source/v3/roles.inc
index 5dc0fbabb5..aa239991d3 100644
--- a/api-ref/source/v3/roles.inc
+++ b/api-ref/source/v3/roles.inc
@@ -166,7 +166,7 @@ Request Parameters
 
    - role: role
    - name: role_name_create_body
-   - domain_id: domain_id_response_body
+   - domain_id: role_domain_id_request_body
 
 Request Example
 ---------------