diff --git a/grade/export/grade_export_form.php b/grade/export/grade_export_form.php
index 157f9c90b79..20a1205285b 100644
--- a/grade/export/grade_export_form.php
+++ b/grade/export/grade_export_form.php
@@ -37,6 +37,11 @@ class grade_export_form extends moodleform {
         if (empty($features['simpleui'])) {
             debugging('Grade export plugin needs updating to support one step exports.', DEBUG_DEVELOPER);
         }
+        if (!empty($features['idnumberrequired'])) {
+            $mform->addElement('header', 'warnings', get_string('warning', 'moodle'));
+            $mform->setExpanded('warnings', true);
+            $mform->addElement('static', 'idnumberwarning', get_string('useridnumberwarning', 'grades'));
+        }
 
         $mform->addElement('header', 'options', get_string('exportformatoptions', 'grades'));
         if (!empty($features['simpleui'])) {
diff --git a/grade/export/xml/lang/en/gradeexport_xml.php b/grade/export/xml/lang/en/gradeexport_xml.php
index 0cba69e75f3..7cb8dbc6e8f 100644
--- a/grade/export/xml/lang/en/gradeexport_xml.php
+++ b/grade/export/xml/lang/en/gradeexport_xml.php
@@ -26,4 +26,3 @@
 $string['pluginname'] = 'XML file';
 $string['xml:publish'] = 'Publish XML grade export';
 $string['xml:view'] = 'Use XML grade export';
-$string['useridnumberwarning'] = 'User\'s without an ID number are excluded from the XML export as they cannot be imported';
\ No newline at end of file
diff --git a/lang/en/grades.php b/lang/en/grades.php
index bbf42e2e846..b5c2d1912c2 100644
--- a/lang/en/grades.php
+++ b/lang/en/grades.php
@@ -683,6 +683,7 @@ $string['usepercent'] = 'Use percent';
 $string['user'] = 'User';
 $string['usergrade'] = 'User {$a->fullname} ({$a->useridnumber}) on item {$a->gradeidnumber}';
 $string['userid'] = 'User ID';
+$string['useridnumberwarning'] = 'Users without an ID number are excluded from the export as they cannot be imported';
 $string['usermappingerror'] = 'User mapping error: Could not find user with {$a->field} of "{$a->value}".';
 $string['usermappingerrorusernotfound'] = 'User mapping error. Could not find user.';
 $string['usermappingerrorcurrentgroup'] = 'User is not a member of current group.';