diff --git a/html/l2.html b/html/l2.html
index b739d0f..6134372 100644
--- a/html/l2.html
+++ b/html/l2.html
@@ -13,13 +13,13 @@
     <p><span data-i18n="l2_shown">Shown:</span> <span id="l2count">-</span></p>
     <table id="l2table">
       <tr>
-        <th><span class="l2sort" onclick="l2SortBy('port')" data-i18n="l2_col_port">Port</span><br>
+        <th><span class="l2sort" onclick="l2SortBy('port')"><span data-i18n="l2_col_port">Port</span><span id="l2a_port" class="l2arrow"></span></span><br>
             <input id="l2f_port" class="l2filter" oninput="l2FilterChanged()" size="5"></th>
-        <th><span class="l2sort" onclick="l2SortBy('mac')">MAC</span><br>
+        <th><span class="l2sort" onclick="l2SortBy('mac')">MAC<span id="l2a_mac" class="l2arrow"></span></span><br>
             <input id="l2f_mac" class="l2filter" oninput="l2FilterChanged()" size="14"></th>
-        <th><span class="l2sort" onclick="l2SortBy('vlan')">VLAN</span><br>
+        <th><span class="l2sort" onclick="l2SortBy('vlan')">VLAN<span id="l2a_vlan" class="l2arrow"></span></span><br>
             <input id="l2f_vlan" class="l2filter" oninput="l2FilterChanged()" size="5"></th>
-        <th><span class="l2sort" onclick="l2SortBy('type')" data-i18n="l2_col_type">Type</span><br>
+        <th><span class="l2sort" onclick="l2SortBy('type')"><span data-i18n="l2_col_type">Type</span><span id="l2a_type" class="l2arrow"></span></span><br>
             <input id="l2f_type" class="l2filter" oninput="l2FilterChanged()" size="8"></th>
         <th data-i18n="l2_col_remove">Remove Entry</th></tr>
       <script src="/l2.js"></script>
diff --git a/html/l2.js b/html/l2.js
index f68f837..20125dc 100644
--- a/html/l2.js
+++ b/html/l2.js
@@ -100,6 +100,10 @@ function renderL2() {
     var x = l2Key(a, l2SortCol), y = l2Key(b, l2SortCol);
     return (x < y ? -1 : x > y ? 1 : 0) * l2SortDir;
   });
+  ['port', 'mac', 'vlan', 'type'].forEach(function(c) {
+    var a = document.getElementById('l2a_' + c);
+    if (a) a.textContent = (c === l2SortCol) ? (l2SortDir > 0 ? ' \u25b2' : ' \u25bc') : ' \u21c5';
+  });
   paintL2(tbl, rows);
   var cnt = document.getElementById('l2count');
   if (cnt) cnt.textContent = rows.length + ' / ' + l2All.length;
diff --git a/html/style.css b/html/style.css
index 3533c6b..758800b 100644
--- a/html/style.css
+++ b/html/style.css
@@ -168,4 +168,5 @@ option { direction: rtl; font-family: sans-serif}
 /* L2 table: sortable headers and per-column filters */
 .l2sort{cursor:pointer;user-select:none}
 .l2sort:hover{text-decoration:underline}
+.l2arrow{opacity:0.55;font-size:0.85em}
 .l2filter{width:100%;box-sizing:border-box;font-weight:normal;font-size:0.9em}