diff --git a/lib/ansible/modules/cloud/openstack/os_group_facts.py b/lib/ansible/modules/cloud/openstack/os_group_facts.py
index e80cc325093..f4af95fb6a8 100644
--- a/lib/ansible/modules/cloud/openstack/os_group_facts.py
+++ b/lib/ansible/modules/cloud/openstack/os_group_facts.py
@@ -32,6 +32,7 @@ options:
    domain:
      description:
         - Name or ID of the domain containing the group if the cloud supports domains
+     type: str
    filters:
      description:
         - A dictionary of meta data to use for further filtering.  Elements of