diff --git a/vmm/src/api/openapi/cloud-hypervisor.yaml b/vmm/src/api/openapi/cloud-hypervisor.yaml
index cf29e802a..af3b23bd9 100644
--- a/vmm/src/api/openapi/cloud-hypervisor.yaml
+++ b/vmm/src/api/openapi/cloud-hypervisor.yaml
@@ -269,6 +269,9 @@ components:
           type: integer
           format: int64
           default: 512 MB
+        hotplug_size:
+          type: integer
+          format: int64
         file:
           type: string
         mergeable: