diff --git a/lang/en_utf8/error.php b/lang/en_utf8/error.php
index 023f984183e..c37100bc5fc 100644
--- a/lang/en_utf8/error.php
+++ b/lang/en_utf8/error.php
@@ -294,6 +294,7 @@ $string['invalidscaleid'] = 'Incorrect scale id';
 $string['invalidsesskey'] = 'Incorrect sesskey submitted, form not accepted!';
 $string['invalidsection'] = 'Course module record contains invalid section';
 $string['invalidshortname'] = 'That\'s an invalid short course name';
+$string['invalidtexcommand'] = 'Forbidden TeX command ($a)';
 $string['invalidurl'] = 'Invalid URL';
 $string['invaliduser'] = 'Invalid user';
 $string['invaliduserid'] = 'Invalid user id';