diff --git a/qt/aqt/previewer.py b/qt/aqt/previewer.py
index 9096a340b..4ceae23c4 100644
--- a/qt/aqt/previewer.py
+++ b/qt/aqt/previewer.py
@@ -1,3 +1,6 @@
+# Copyright: Ankitects Pty Ltd and contributors
+# License: GNU AGPL, version 3 or later; http://www.gnu.org/licenses/agpl.html
+
 import json
 import re
 import time