diff --git a/404.html b/404.html
index 5e5fa8f..acb4ab3 100644
--- a/404.html
+++ b/404.html
@@ -16,6 +16,7 @@
     <link rel="stylesheet" href="404.css">
   </head>
   <body>
+    <span id="new-window-desc" class="visually-hidden">새 창에서 열림</span>
     <a href="#top" class="skip-link">본문으로 건너뛰기</a>
     <header class="site-header">
       <a class="brand" href="/" aria-label="Contextual Wisdom Lab home">
@@ -31,7 +32,7 @@
         <a href="/#projects">프로젝트</a>
         <a href="/#forks">Fork</a>
         <a href="/#work">작업</a>
-        <a target="_blank" rel="noopener noreferrer" href="https://github.com/ContextualWisdomLab">GitHub</a>
+        <a aria-describedby="new-window-desc" target="_blank" rel="noopener noreferrer" href="https://github.com/ContextualWisdomLab" title="새 창에서 열림">GitHub</a>
       </nav>
     </header>
 
@@ -59,7 +60,7 @@ <h1 class="not-found-title">페이지를 찾을 수 없습니다</h1>
       >
       <p>
         <span>Founded by</span>
-        <a target="_blank" rel="noopener noreferrer" href="https://github.com/seonghobae">Seongho Bae</a>.
+        <a aria-describedby="new-window-desc" target="_blank" rel="noopener noreferrer" href="https://github.com/seonghobae" title="새 창에서 열림">Seongho Bae</a>.
         <span>Context into judgment. Judgment into action.</span>
       </p>
     </footer>