diff --git a/index.html b/index.html
index d9eead6..75bda36 100644
--- a/index.html
+++ b/index.html
@@ -23,7 +23,7 @@ <h1>Bookbinder JS</h1>
             contribute, view the project's <a href="https://github.com/momijizukamori/bookbinder-js">Github repository</a>.
             If you have issues with this version, you can try the <a href="%BASE_URL%old/index.html">old version</a> instead, which only supports folio layouts.
             <center style="font-family:monospace;
-    padding-top: 0.75em;font-variant-caps: small-caps;">current version: %PACKAGE_VERSION%</center>
+    padding-top: 0.75em;font-variant-caps: small-caps;">current version: %PACKAGE_VERSION% (old version)</center>
         </div>
         <div class="section" id="settings">
             <h2>Settings</h2>