diff --git a/open-api/rest-catalog-open-api.yaml b/open-api/rest-catalog-open-api.yaml
index 2ef154f18f26..eef199bf445f 100644
--- a/open-api/rest-catalog-open-api.yaml
+++ b/open-api/rest-catalog-open-api.yaml
@@ -2293,6 +2293,7 @@ components:
           type: boolean
         doc:
           type: string
+          nullable: true
         initial-default:
           $ref: "#/components/schemas/PrimitiveTypeValue"
         write-default: