diff --git a/README.md b/README.md
index c132f03..4010bd4 100644
--- a/README.md
+++ b/README.md
@@ -55,9 +55,12 @@ See [Releases page](https://github.com/azu/kindle-highlight-to-markdown/releases
 
 ## Running tests
 
-Install devDependencies and Run `npm test`:
+Add Cookie to `.cookie` file
+
+and Edit test/node.ts and Run tests
+
+    npm run debug
 
-    npm test
 
 ## Contributing
 
diff --git a/package.json b/package.json
index 3f2ce04..8d467d1 100644
--- a/package.json
+++ b/package.json
@@ -27,7 +27,7 @@
     "src/"
   ],
   "scripts": {
-    "main": "ts-node test/node.ts",
+    "debug": "ts-node test/node.ts",
     "build": "tsc -p . && tsc -p ./tsconfig.module.json",
     "clean": "rimraf lib/ module/",
     "format": "prettier --write \"**/*.{js,jsx,ts,tsx,css}\"",
diff --git a/src/markdown.ts b/src/markdown.ts
index ae66dab..da4e911 100644
--- a/src/markdown.ts
+++ b/src/markdown.ts
@@ -1,12 +1,19 @@
 import { ParseResult } from "./parse";
 import { mdImg, mdLink } from "markdown-function";
 
-export const toMarkdown = (parseResult: ParseResult): string => {
+export type ToMarkdownOptions = {
+    defaultHighlightMessage?: string;
+};
+export const toMarkdown = (parseResult: ParseResult, options?: ToMarkdownOptions): string => {
     const { title, url, coverImageUrl, annotations } = parseResult;
+    const defaultHighlightMessage = options?.defaultHighlightMessage ?? "**CAN NOT SHOW THE HIGHLIGHT**";
     const annotationsBody = annotations
         .map((annotation) => {
             const note = annotation.note ? `\n\n${annotation.note}` : "";
-            return `> ${annotation.highlight.split("\n").join("\n> ")}  
+            // Some highlight is empty string because can not get the highlight.
+            return `> ${
+                annotation.highlight === "" ? defaultHighlightMessage : annotation.highlight.split("\n").join("\n> ")
+            }  
 > Location: ${mdLink({
                 url: annotation.kindleUrl,
                 title: String(annotation.locationNumber),
diff --git a/src/parse.ts b/src/parse.ts
index 377c28b..62e38d5 100644
--- a/src/parse.ts
+++ b/src/parse.ts
@@ -16,7 +16,7 @@ export type ParseResult = {
     url: string;
     annotations: Annotation[];
 };
-export const parsePage = (window: Window) => {
+export const parsePage = (window: Window): ParseResult => {
     const pages = window.document.querySelectorAll<HTMLDivElement>("#a-page");
     const page = pages[pages.length - 1]; // select child #a-page if nested #a-page
     const title = page.querySelector("h3.kp-notebook-metadata") as HTMLHeadingElement;
@@ -30,11 +30,7 @@ export const parsePage = (window: Window) => {
     assertOk(annotationNodes.length > 0, "annotations not found");
     const annotations: Annotation[] = Array.from(annotationNodes)
         .filter((annotation) => {
-            return (
-                annotation.getAttribute("id") !== "empty-annotations-pane" &&
-                // Sorry, we’re unable to display this type of content.
-                annotation.querySelector(`[id="highlight"]`) !== null
-            );
+            return annotation.getAttribute("id") !== "empty-annotations-pane";
         })
         .map((annotation) => {
             const noteNode = annotation.querySelector(`[id="note"]`) as HTMLSpanElement;
@@ -42,17 +38,21 @@ export const parsePage = (window: Window) => {
             const locationNode = annotation.querySelector(`[id="kp-annotation-location"]`) as HTMLInputElement;
             assertOk(locationNode, "locationNode is not found");
             const highlightNode = annotation.querySelector(`[id="highlight"]`) as HTMLSpanElement;
-            assertOk(highlightNode, "highlightNode is not found");
+            // Kindle disappear the highlight, see https://github.com/azu/kindle-highlight-to-markdown/issues/3
+            // Sorry, we’re unable to display this type of content.
+            const isEmptyHighlight = highlightNode === null;
+            const highlightText = isEmptyHighlight ? "" : highlightNode.textContent;
+            assertOk(highlightText !== undefined, "highlightText is not found");
             const locationNumber = Number(locationNode.value);
             return {
                 note: noteValue,
                 locationNumber: locationNumber,
-                highlight: highlightNode.textContent as string,
+                highlight: highlightText as string,
                 kindleUrl: `kindle://book?action=open&asin=${asinValue}&location=${locationNumber}`
             };
         });
     return {
-        title: title.textContent?.trim(),
+        title: title.textContent?.trim() ?? "",
         coverImageUrl: coverImage.src,
         asin: asinValue,
         url: `https://www.amazon.co.jp/dp/${asinValue}`, // TODO: hardcode
diff --git a/test/node.ts b/test/node.ts
index 0d67a5a..d8d83a1 100644
--- a/test/node.ts
+++ b/test/node.ts
@@ -1,7 +1,7 @@
 import { JSDOM, CookieJar } from "jsdom";
 import * as fs from "fs/promises";
 import path from "path";
-import { parsePage } from "../src";
+import { parsePage, toMarkdown } from "../src";
 
 (async function () {
     const cookieString = (await fs.readFile(path.join(__dirname, "../.cookie"), "utf-8")).replace("^Cookie: ", "");
@@ -13,5 +13,7 @@ import { parsePage } from "../src";
     const { window } = await JSDOM.fromURL("https://read.amazon.co.jp/notebook?asin=B09RZG8KR1&contentLimitState=&", {
         cookieJar
     });
-    console.log(parsePage(window as any as Window));
+    const message = parsePage(window as any as Window);
+    console.log(message);
+    console.log(toMarkdown(message));
 })();