diff --git a/templates/index.html b/templates/index.html
index a6914a1..3c785c0 100644
--- a/templates/index.html
+++ b/templates/index.html
@@ -112,6 +112,11 @@
                             <span class="mode-name">APRS</span>
                             <span class="mode-desc">Amateur radio</span>
                         </button>
+                        <button class="mode-card" onclick="selectMode('isms')">
+                            <span class="mode-icon">📊</span>
+                            <span class="mode-name">ISMS</span>
+                            <span class="mode-desc">Spectrum monitoring</span>
+                        </button>
                     </div>
                 </div>
             </div>