diff --git a/README.md b/README.md
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--- a/README.md
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@@ -1,3 +1,9 @@
+<p>
+<a href="https://codefund.io/properties/501/visit-sponsor">
+
+</a>
+</p>
+
 # Advanced React Hooks
 
 👋 hi there! My name is [Kent C. Dodds](https://kentcdodds.com) and this is the
</div><div class="naked_ctrl">
<form action="/index.cgi/larger-text" method="get" name="gate">
<p><a href="http://altstyle.alfasado.net">AltStyle</a> によって変換されたページ <a href="https://patch-diff.githubusercontent.com/raw/epicweb-dev/advanced-react-apis/pull/21.diff">(-&gt;オリジナル)</a>
/ <label>アドレス: <input type="text" name="naked_post_url" value="https://patch-diff.githubusercontent.com/raw/epicweb-dev/advanced-react-apis/pull/21.diff" size="22" /></label> <label>モード: <select name="naked_post_mode">
<option value="default">デフォルト</option>
<option value="speech">音声ブラウザ</option>
<option value="ruby">ルビ付き</option>
<option value="contrast">配色反転</option>
<option value="larger-text" selected="selected">文字拡大</option>
<option value="mobile">モバイル</option>
</select>
<input type="submit" value="表示" />
</p>
</form>
</div>