1 files changed, 2 insertions, 1 deletions
diff --git a/Lib/enum.py b/Lib/enum.py
index 49b552b..bc24f2a 100644
--- a/Lib/enum.py
+++ b/Lib/enum.py
@@ -76,7 +76,8 @@ class _EnumDict(dict):
                     '_order_', '_create_pseudo_member_',
                     '_generate_next_value_', '_missing_', '_ignore_',
                     ):
-                raise ValueError('_names_ are reserved for future Enum use')
+                raise ValueError(f'_sunder_ names, such as "{key}", are '
+                                  'reserved for future Enum use')
             if key == '_generate_next_value_':
                 # check if members already defined as auto()
                 if self._auto_called: