diff --git a/api/form/hml/basic/calendar.json b/api/form/hml/basic/calendar.json
index 33865d0e6b348e93c08ca7ed3b1fc9a41bbed29e..c90db7fee670e5afe95b723bfa2a7792226ce9bc 100644
--- a/api/form/hml/basic/calendar.json
+++ b/api/form/hml/basic/calendar.json
@@ -25,6 +25,18 @@
       ],
       "type": "string"
     },
+    {
+      "name": "offdays",
+      "supportedDevices": ["phone", "tablet", "wearable", "tv", "car"],
+      "required": false,
+      "description": [
+        {
+          "name": "",
+          "supportedDevices": ["phone", "tablet", "wearable", "tv", "car"]
+        }
+      ],
+      "type": "string"
+    },
     {
       "name": "cardcalendar",
       "supportedDevices": ["phone", "tablet", "wearable", "tv", "car"],