diff --git a/backup/moodle2/backup_pdfannotator_stepslib.php b/backup/moodle2/backup_pdfannotator_stepslib.php
index 0ae3352bedf3a00ddbdb9ccc19986df8b46055d5..fa0545c092d70a1a7ea5f319a740d3ce655d8a95 100644
--- a/backup/moodle2/backup_pdfannotator_stepslib.php
+++ b/backup/moodle2/backup_pdfannotator_stepslib.php
@@ -63,7 +63,7 @@ class backup_pdfannotator_activity_structure_step extends backup_activity_struct
                 $subscription = new backup_nested_element('subscription', array('id'), array('userid'));
 
                 $comments = new backup_nested_element('comments');
-                $c = array('pdfannotatorid', 'userid', 'content', 'timecreated', 'timemodified', 'modifiedby', 'visibility', 'isquestion', 'isdeleted', 'seen');
+                $c = array('pdfannotatorid', 'userid', 'content', 'timecreated', 'timemodified', 'modifiedby', 'visibility', 'isquestion', 'isdeleted', 'ishidden', 'solved');
                 $comment = new backup_nested_element('comment', array('id'), $c);
 
                     $votes = new backup_nested_element('votes');
diff --git a/lang/en/pdfannotator.php b/lang/en/pdfannotator.php
index f2028dfd60a047729e9658aa1372edb337226ecf..e43789649c118ed57cdf88f9811ecb335305bd92 100644
--- a/lang/en/pdfannotator.php
+++ b/lang/en/pdfannotator.php
@@ -324,6 +324,7 @@ $string['questionstabicon'] = 'Questions';
 $string['questionstabicon_help'] = 'This page displays all unsolved questions that were asked in this course. You can also choose to see all or all solved questions in this course.';
 $string['questionstitle'] = 'Questions on page';
 $string['read'] = 'Read';
+$string['reason'] = 'Explanation';
 $string['recievenewquestionnotifications'] = 'Notify about new questions';
 $string['recipient'] = 'Recipient/s';
 $string['recipient_help'] = 'To select several persons, hold down "Ctrl"';