diff --git a/source/js/main.js b/source/js/main.js
index 7f46128..2b31fb7 100644
--- a/source/js/main.js
+++ b/source/js/main.js
@@ -98,6 +98,8 @@
 
         if (fold) {
             $('figure.highlight').each(function() {
+                $(this).addClass('foldable'); // add 'foldable' class as long as fold is enabled
+
                 if ($(this).find('figcaption').find('span').length > 0) {
                     const span = $(this).find('figcaption').find('span');
                     if (span[0].innerText.indexOf('>folded') > -1) {