diff --git a/htdocs/index.html b/htdocs/index.html
index 854236f..7e9f380 100644
--- a/htdocs/index.html
+++ b/htdocs/index.html
@@ -80,10 +80,10 @@
                         <select id="openwebrx-secondary-demod-listbox" onchange="secondary_demod_listbox_changed();">
                             <option value="none"></option>
                             <option value="bpsk31">BPSK31</option>
-                            <option value="ft8">FT8</option>
-                            <option value="wspr">WSPR</option>
-                            <option value="jt65">JT65</option>
-                            <option value="jt9">JT9</option>
+                            <option value="ft8" data-feature="wsjt-x">FT8</option>
+                            <option value="wspr" data-feature="wsjt-x">WSPR</option>
+                            <option value="jt65" data-feature="wsjt-x">JT65</option>
+                            <option value="jt9" data-feature="wsjt-x">JT9</option>
                         </select>
                     </div>
                     <div class="openwebrx-panel-line">