diff --git a/schemas/toc.schema.json b/schemas/toc.schema.json
index 90d97035294..8bf1a9d7b60 100644
--- a/schemas/toc.schema.json
+++ b/schemas/toc.schema.json
@@ -82,6 +82,10 @@
           "default": 0,
           "description": "Specify the order of toc item, TOCs with a smaller order value are picked first."
         },
+        "type": {
+          "type": "string",
+          "description": "Specify the type of toc item."
+        },
         "items": {
           "type": "array",
           "description": "List of TOC items.",