diff --git a/accounting/exceptions.py b/accounting/exceptions.py
index 694c6a616cd136ed5d991f07cf34b64298121c7e..a2e841e1fde23b131af88002c7755c52b43750a7 100644
--- a/accounting/exceptions.py
+++ b/accounting/exceptions.py
@@ -1,3 +1,7 @@
+# Part of accounting-api project:
+# https://gitorious.org/conservancy/accounting-api
+# License: AGPLv3-or-later
+
 class AccountingException(Exception):
     '''
     Used as a base for exceptions that are returned to the caller via the