diff --git a/package.json b/package.json
index f26fb16..1ab36a8 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@samchon/openapi",
-  "version": "0.1.7",
+  "version": "0.1.8",
   "description": "OpenAPI definitions and converters for 'typia' and 'nestia'.",
   "main": "./lib/index.js",
   "typings": "./lib/index.d.ts",
diff --git a/src/OpenApi.ts b/src/OpenApi.ts
index 09f4e88..fbc7f86 100644
--- a/src/OpenApi.ts
+++ b/src/OpenApi.ts
@@ -82,7 +82,7 @@ export namespace OpenApi {
     >;
     security?: Record<string, string[]>[];
     tags?: IDocument.ITag[];
-    "x-samchon-emended"?: boolean;
+    "x-samchon-emended": true;
   }
   export namespace IDocument {
     export interface IInfo {
diff --git a/test/index.ts b/test/index.ts
index 61c8d0c..5955aaa 100644
--- a/test/index.ts
+++ b/test/index.ts
@@ -39,10 +39,21 @@ const iterate = async (directory: string): Promise<void> => {
   }
 };
 const main = async (): Promise<void> => {
+  // TEST CONVERSION
+  const NORMALIZED: string = `${__dirname}/../../examples/normalized`;
   try {
-    await fs.promises.mkdir(`${__dirname}/../../examples/normalized`);
+    await fs.promises.mkdir(NORMALIZED);
   } catch {}
   await iterate(`${__dirname}/../../examples`);
+
+  // TYPE ASSERTIONS
+  for (const file of await fs.promises.readdir(NORMALIZED)) {
+    const document: OpenApi.IDocument = JSON.parse(
+      await fs.promises.readFile(`${NORMALIZED}/${file}`, "utf8"),
+    );
+    typia.assert<OpenApi.IDocument>(document);
+    typia.assert<OpenApiV3_1.IDocument>(document);
+  }
 };
 main().catch((exp) => {
   console.error(exp);