diff --git a/djangoproject/static/js/app.js b/djangoproject/static/js/app.js
index 85b84c5ff..1cf3b5525 100644
--- a/djangoproject/static/js/app.js
+++ b/djangoproject/static/js/app.js
@@ -1,3 +1,5 @@
+// Toggle persistent display of documentation version and language options if
+// the element is clicked
 document.querySelectorAll('.doc-switcher li.current').forEach(function (el) {
   el.addEventListener('click', function () {
     this.parentElement.classList.toggle('open');