diff --git a/module/webui/index.html b/module/webui/index.html
index 9681903..2c5f3eb 100644
--- a/module/webui/index.html
+++ b/module/webui/index.html
@@ -27,6 +27,7 @@
             </button>
             <div class="language-menu">
                 <button class="language-option" data-lang="en-US">English</button>
+                <button class="language-option" data-lang="ja-JP">日本語</button>
                 <button class="language-option" data-lang="ru-RU">Русский</button>
                 <button class="language-option" data-lang="tl-PH">Tagalog</button>
                 <button class="language-option" data-lang="zh-CN">中文（简体）</button>