diff --git a/music_metadata/edi/fields.py b/music_metadata/edi/fields.py
index ee549b3..33218de 100644
--- a/music_metadata/edi/fields.py
+++ b/music_metadata/edi/fields.py
@@ -82,6 +82,7 @@ def to_dict(self, record, label=None, verbosity=1):
         d = OrderedDict()
         if verbosity > 1:
             d['field_type'] = self.verbose_type
+            d['field_mandatory'] = self._mandatory
         d['valid'] = valid
         if not valid or verbosity > 1:
             d['error'] = str(record.errors.get(label))