diff --git a/docx-wasm/js/json/index.ts b/docx-wasm/js/json/index.ts
index 741f03b..27f5e97 100644
--- a/docx-wasm/js/json/index.ts
+++ b/docx-wasm/js/json/index.ts
@@ -30,7 +30,9 @@ export type DocxJSON = {
       };
     };
     custom: {
-      [key: string]: string;
+      properties: {
+        [key: string]: string;
+      };
     };
   };
   styles: StylesJSON;
diff --git a/docx-wasm/package.json b/docx-wasm/package.json
index 61edf4d..eae4f1d 100644
--- a/docx-wasm/package.json
+++ b/docx-wasm/package.json
@@ -1,6 +1,6 @@
 {
   "name": "docx-wasm",
-  "version": "0.0.198",
+  "version": "0.0.199",
   "main": "dist/node/index.js",
   "browser": "dist/web/index.js",
   "author": "bokuweb <bokuweb12@gmail.com>",