diff --git a/lang/en/moodle.php b/lang/en/moodle.php
index 7a61b0a5a5f..23a610132c9 100644
--- a/lang/en/moodle.php
+++ b/lang/en/moodle.php
@@ -1678,7 +1678,7 @@ $string['uploadcantwrite'] = 'Failed to write file to disk';
 $string['uploadedfile'] = 'File uploaded successfully';
 $string['uploadedfileto'] = 'Uploaded {$a->file} to {$a->directory}';
 $string['uploadedfiletoobig'] = 'Sorry, but that file is too big (limit is {$a} bytes)';
-$string['uploadextension'] = 'File upload stopped by extension';
+$string['uploadextension'] = 'File upload stopped by a PHP extension';
 $string['uploadfailednotrecovering'] = 'Your file upload has failed because there was a problem with one of the files, {$a->name}.<br /> Here is a log of the problems:<br />{$a->problem}<br />Not recovering.';
 $string['uploadfilelog'] = 'Upload log for file {$a}';
 $string['uploadformlimit'] = 'Uploaded file exceeded the maximum size limit set by the form';