diff --git a/lang/en/plugin.php b/lang/en/plugin.php
index 6cc20daccbd..824fdfa3c20 100644
--- a/lang/en/plugin.php
+++ b/lang/en/plugin.php
@@ -156,6 +156,8 @@ $string['type_gradeexport'] = 'Grade export method';
 $string['type_gradeexport_plural'] = 'Grade export methods';
 $string['type_gradeimport'] = 'Grade import method';
 $string['type_gradeimport_plural'] = 'Grade import methods';
+$string['type_gradepenalty'] = 'Grade penalty';
+$string['type_gradepenalty_plural'] = 'Grade penalties';
 $string['type_gradereport'] = 'Gradebook report';
 $string['type_gradereport_plural'] = 'Gradebook reports';
 $string['type_gradingform'] = 'Advanced grading method';
diff --git a/lib/plugins.json b/lib/plugins.json
index e8e9cddf445..c8e5fc273d2 100644
--- a/lib/plugins.json
+++ b/lib/plugins.json
@@ -221,6 +221,9 @@
             "direct",
             "xml"
         ],
+        "gradepenalty": [
+            "duedate"
+        ],
         "gradereport": [
             "grader",
             "history",