diff --git a/addressfield/fields.py b/addressfield/fields.py
index 0f60152791094287929b4b9b3301d2e055fc9767..32c0c725bf7f41eaae170749de44c675a94f3fd2 100644
--- a/addressfield/fields.py
+++ b/addressfield/fields.py
@@ -28,6 +28,10 @@ def flatten_data(data):
 
 
 class AddressField(forms.CharField):
+    """
+    The field stores the address in a flattened form,
+    so the locality components are on the same level as country or premise
+    """
     widget = AddressWidget
     data = VALIDATION_DATA