diff --git a/course/completion.js b/course/completion.js
index 58e5477cac6..8e741423fbd 100644
--- a/course/completion.js
+++ b/course/completion.js
@@ -20,7 +20,8 @@ M.core_completion.init = function(Y) {
             var current = args.state.get('value');
             var modulename = args.modulename.get('value'),
                 altstr,
-                iconkey;
+                iconkey,
+                button = args.image.get('parentNode');
 
 
             if (current == 1) {
@@ -32,6 +33,7 @@ M.core_completion.init = function(Y) {
                 iconkey = 'i/completion-manual-n';
                 args.state.set('value', 1);
             }
+            button.set('title', altstr);
 
             require(['core/templates', 'core/notification'], function(Templates, Notification) {
                 Templates.renderPix(iconkey, 'core', altstr).then(function(html) {
diff --git a/course/renderer.php b/course/renderer.php
index b3cd9706b28..b78acb6d38c 100644
--- a/course/renderer.php
+++ b/course/renderer.php
@@ -551,7 +551,8 @@ class core_course_renderer extends plugin_renderer_base {
                 $output .= html_writer::empty_tag('input', array(
                     'type' => 'hidden', 'name' => 'completionstate', 'value' => $newstate));
                 $output .= html_writer::tag('button',
-                    $this->output->pix_icon('i/completion-' . $completionicon, $imgalt), array('class' => 'btn btn-link'));
+                    $this->output->pix_icon('i/completion-' . $completionicon, $imgalt),
+                        array('class' => 'btn btn-link', 'title' => $imgalt));
                 $output .= html_writer::end_tag('div');
                 $output .= html_writer::end_tag('form');
             } else {