diff --git a/js/plugins/reference_footnotes/dialogs/footnotes.js b/js/plugins/reference_footnotes/dialogs/footnotes.js
index a45674d..b6c3c0c 100644
--- a/js/plugins/reference_footnotes/dialogs/footnotes.js
+++ b/js/plugins/reference_footnotes/dialogs/footnotes.js
@@ -34,6 +34,11 @@
                                 }
                             }
                           },
+                          {
+                            id: 'html-help',
+                            type: 'html',
+                            html: 'HTML tags can be used, e.g., <strong>, <em>, <a href="...">',
+                          },
                           {
                             id: 'page',
                             type: 'text',