diff --git a/index.html b/index.html
index 9548149..bba8f84 100644
--- a/index.html
+++ b/index.html
@@ -62,7 +62,7 @@
         const output = document.getElementById("output");
         const copyButton = document.getElementById("copy");
         input.addEventListener("keyup", e => {
-            output.value = `<span lang="ja">${input.value.replace(/\[([^\]]*)]{([^\}]*)}/g, "$1<rp>(</rp><rt>$2</rt><rp>)</rp>")}</span>`;
+            output.value = `<span lang="ja">${input.value.replace(/\[([^\]]*)]{([^\}]*)}/g, "<ruby>$1<rp>(</rp><rt>$2</rt><rp>)</rp></ruby>")}</span>`;
             copyButton.innerHTML = "Copy";
         });
         copyButton.addEventListener("click", e => {