diff --git a/README.md b/README.md
index c1626c2..5507ad5 100644
--- a/README.md
+++ b/README.md
@@ -5,6 +5,7 @@
 
 Copyright 2020 Xogium and other contributors
 This project is licensed under the GNU GPL version 3 or later.
+Some portions are licensed under the CC0.
 This project includes third party works as-is or modified.
 These works are authored by others and available under open source licenses.
 See 'COPYRIGHT.md' for full details.