diff --git a/classes/edit_form.php b/classes/edit_form.php
index 1c50c32..55fa1f8 100644
--- a/classes/edit_form.php
+++ b/classes/edit_form.php
@@ -54,8 +54,8 @@ class edit_form extends \moodleform {
         $mform->setType('name', PARAM_TEXT);
         $mform->addRule('name', null, 'required');
 
-        $mform->addElement('text', 'html', get_string('html', 'htmlcert'));
-        $mform->setType('html', PARAM_TEXT);
+        $mform->addElement('editor', 'html', get_string('html', 'htmlcert'));
+        $mform->setType('html', PARAM_RAW);
         $mform->addRule('html', null, 'required');
 
         // Add the submit buttons.