diff --git a/coolamqp/framing/compilation/xml_fields.py b/coolamqp/framing/compilation/xml_fields.py
index 6b2853d7adfc52a59678905a5862ed3f0bd40f19..8b521ab5d553f8fe2ca3bb255f6aae66e1c05fab 100644
--- a/coolamqp/framing/compilation/xml_fields.py
+++ b/coolamqp/framing/compilation/xml_fields.py
@@ -60,7 +60,9 @@ class _ValueField(_Field):
             else:
                 return self.default
 
+
 class _SimpleField(_ValueField):
+    """XML attribute is the same as name, has a type and can be default"""
     def __init__(self, name, field_type=nop, default=_Required):
         super(_SimpleField, self).__init__(name, name, field_type, default)