diff --git a/accounting/models.py b/accounting/models.py
index c09dc57962b2d259cfa430756a8bb81682577343..3b48e37214579d24c088b78c6419aa10759cb231 100644
--- a/accounting/models.py
+++ b/accounting/models.py
@@ -1,3 +1,7 @@
+# Part of accounting-api project:
+# https://gitorious.org/conservancy/accounting-api
+# License: AGPLv3-or-later
+
 import uuid
 from decimal import Decimal