diff --git a/static/piano/index.html b/static/piano/index.html
index 7b1f048..915b633 100644
--- a/static/piano/index.html
+++ b/static/piano/index.html
@@ -8,6 +8,7 @@
   <label for="select-note-layout">note layout:</label>
   <select name="select-note-layout" id="select-note-layout">
     <option value="isomorphic-2-1" selected>isomorphic 2,1</option>
+    <option value="isomorphic-3-2">isomorphic 3,2</option>
     <option value="isomorphic-5-2">isomorphic 5,2</option>
     <option value="classic">classic piano</option>
   </select>
@@ -38,6 +39,8 @@
       useClassicPiano();
     } else if (layout == 'isomorphic-2-1') {
       useIsomorphic(2, 1);
+    } else if (layout == 'isomorphic-3-2') {
+      useIsomorphic(3, 2);
     } else if (layout == 'isomorphic-5-2') {
       useIsomorphic(5, 2);
     }