diff --git a/frontend/themes/apus/masonry.css b/frontend/themes/apus/masonry.css
index c79ac4c..bb63dd0 100644
--- a/frontend/themes/apus/masonry.css
+++ b/frontend/themes/apus/masonry.css
@@ -1,3 +1,21 @@
+/*
+ * Apus - A social wall for conferences with additional features.
+ * Copyright (C) Marcus Fihlon and the individual contributors to Apus.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published
+ * by the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
 .masonry {
     --masonry-gap: var(--lumo-space-m);
     --masonry-brick-width: 270px;