diff --git a/vmm/src/api/openapi/cloud-hypervisor.yaml b/vmm/src/api/openapi/cloud-hypervisor.yaml
index 8fabcc39e..f92037224 100644
--- a/vmm/src/api/openapi/cloud-hypervisor.yaml
+++ b/vmm/src/api/openapi/cloud-hypervisor.yaml
@@ -470,6 +470,9 @@ components:
         hugepages:
           type: boolean
           default: false
+        balloon:
+          type: boolean
+          default: false
 
     KernelConfig:
       required: