diff --git a/NOTICE b/NOTICE
index 306a8b20f1..0967e9bd8d 100644
--- a/NOTICE
+++ b/NOTICE
@@ -1,2 +1,5 @@
 Backstage
 Copyright 2020 Spotify AB
+
+Portions of this software were developed by third-party software vendors:
+- Tech Radar Plugin (https://opensource.zalando.com/tech-radar/), Copyright (c) 2017 Zalando SE