diff --git a/web/app.js b/web/app.js
index 6f6561b..fed6582 100644
--- a/web/app.js
+++ b/web/app.js
@@ -42,6 +42,7 @@ const recDemodToggle = qs('recDemodToggle');
 const recDecodeToggle = qs('recDecodeToggle');
 const recMinSNR = qs('recMinSNR');
 const recMaxDisk = qs('recMaxDisk');
+const recClassFilter = qs('recClassFilter');
 
 const signalList = qs('signalList');
 const eventList = qs('eventList');
diff --git a/web/index.html b/web/index.html
index 773ce5d..65ce04a 100644
--- a/web/index.html
+++ b/web/index.html
@@ -152,6 +152,7 @@
               </div>
               <label class="field"><span>Min SNR (dB)</span><input id="recMinSNR" type="number" step="1" min="0" /></label>
               <label class="field"><span>Max Disk (MB)</span><input id="recMaxDisk" type="number" step="256" min="0" /></label>
+              <label class="field"><span>Class Filter (CSV)</span><input id="recClassFilter" type="text" placeholder="e.g. NFM,USB" /></label>
             </div>
 
             <div class="form-group">