diff --git a/assets/js/legacy-script.js b/assets/js/legacy-script.js
index f0bb589a399ba..6db12d451de03 100644
--- a/assets/js/legacy-script.js
+++ b/assets/js/legacy-script.js
@@ -144,9 +144,13 @@ var kub = (function () {
     }
 
     function toggleMenu() {
+        var hamburger = document.getElementById('hamburger');
         // Clickable for Bootstrap "lg" and narrower
         if (window.innerWidth < 992) {
             pushmenu.show('primary');
+            if (hamburger) {
+                hamburger.setAttribute('aria-expanded', 'true');
+            }
         }
 
         else {
@@ -158,6 +162,10 @@ var kub = (function () {
 
             header.css({height: px(newHeight)});
             html.toggleClass('open-nav');
+            if (hamburger) {
+                var isOpen = html.hasClass('open-nav');
+                hamburger.setAttribute('aria-expanded', isOpen ? 'true' : 'false');
+            }
         }
     }
 
@@ -467,6 +475,11 @@ var pushmenu = (function(){
         function closeMe(e) {
             if (e.target == sled) return;
 
+            var hamburger = document.getElementById('hamburger');
+            if (hamburger) {
+                hamburger.setAttribute('aria-expanded', 'false');
+            }
+
             $(el).removeClass('on');
             setTimeout(function(){
                 $(el).css({display: 'none'});
diff --git a/i18n/en/en.toml b/i18n/en/en.toml
index 353d62b20a68b..3d5208e8cd698 100644
--- a/i18n/en/en.toml
+++ b/i18n/en/en.toml
@@ -732,6 +732,9 @@ other = "See Also"
 [sidebar_toggle_nav]
 other = "Toggle section navigation"
 
+[toggle_navigation]
+other = "Toggle navigation"
+
 [subscribe_button]
 other = "Subscribe"
 
diff --git a/layouts/partials/navbar.html b/layouts/partials/navbar.html
index 3333d20099c7e..ad7bf51582c52 100644
--- a/layouts/partials/navbar.html
+++ b/layouts/partials/navbar.html
@@ -82,5 +82,5 @@
     The menu overlay is added to the DOM and shown/hidden all by JS.
     We should explore a Hugo way of doing this.
   */ -}}
-  <button id="hamburger" class="btn fas fa-bars" onclick="kub.toggleMenu()" data-auto-burger-exclude></button>
+  <button id="hamburger" class="btn fas fa-bars" onclick="kub.toggleMenu()" data-auto-burger-exclude aria-label="{{ T "toggle_navigation" }}" aria-expanded="false"></button>
 </nav>