diff --git a/question/type/ddimageortext/lang/en/qtype_ddimageortext.php b/question/type/ddimageortext/lang/en/qtype_ddimageortext.php
index 014bf9e1a4b..1ca222417ee 100644
--- a/question/type/ddimageortext/lang/en/qtype_ddimageortext.php
+++ b/question/type/ddimageortext/lang/en/qtype_ddimageortext.php
@@ -60,7 +60,7 @@ $string['pluginnamesummary'] = 'Images or text labels are dragged and dropped in
 $string['previewarea'] = 'Preview area -';
 $string['previewareaheader'] = 'Preview';
 $string['previewareamessage'] = 'Select a background image file and select draggable images or just enter text that will be made draggable. Then choose a drag item for each \'drop zone\', and drag the drag item to where the student should drag it to.';
-$string['refresh'] = 'Refresh Preview';
+$string['refresh'] = 'Refresh preview';
 $string['shuffleimages'] = 'Shuffle drag items each time question is attempted';
 $string['summarisechoice'] = '{$a->no}. {$a->text}';
 $string['summariseplace'] = '{$a->no}. {$a->text}';