diff --git a/lang/en/lesson.php b/lang/en/lesson.php
index 455699b8799..47b18ca48b0 100644
--- a/lang/en/lesson.php
+++ b/lang/en/lesson.php
@@ -105,10 +105,12 @@ $string['leftduringtimed'] = 'You have left during a timed lesson.<br />Please c
 $string['leftduringtimednoretake'] = 'You have left during a timed lesson and you are<br />not allowed to retake or continue the lesson.';
 $string['lesson'] = '$a lesson';
 $string['lessonclosed'] = 'This lesson closed on $a.';
+$string['lessoncloses'] = 'Lesson closes';
 $string['lessondefault'] = 'Use this lesson\'s settings as defaults';
 $string['lessonformating'] = 'Lesson formating';
 $string['lessonmenu'] = 'Lesson menu';
 $string['lessonopen'] = 'This lesson will be open on $a.';
+$string['lessonopens'] = 'Lesson opens';
 $string['lessonstats'] = 'Lesson statistics';
 $string['loginfail'] = 'Login failed, please try again...';
 $string['lowscore'] = 'Low score';