diff --git a/vmm/src/api/openapi/cloud-hypervisor.yaml b/vmm/src/api/openapi/cloud-hypervisor.yaml
index 1e19e7224..d10832101 100644
--- a/vmm/src/api/openapi/cloud-hypervisor.yaml
+++ b/vmm/src/api/openapi/cloud-hypervisor.yaml
@@ -941,6 +941,9 @@ components:
           type: array
           items:
             $ref: "#/components/schemas/VirtQueueAffinity"
+        backing_files:
+          type: boolean
+          default: false
 
     NetConfig:
       type: object