diff --git a/accounting/gtkclient.py b/accounting/gtkclient.py
index aa6ca963ab664bd979d73ed8c7779c8d2d827721..be85226a7e471a0e650a1fc989759aae7ffa0d2b 100644
--- a/accounting/gtkclient.py
+++ b/accounting/gtkclient.py
@@ -1,3 +1,7 @@
+# Part of accounting-api project:
+# https://gitorious.org/conservancy/accounting-api
+# License: AGPLv3-or-later
+
 import sys
 import logging
 import threading