diff --git a/.reuse/dep5 b/.reuse/dep5
index 85cac0fc171..f1df9b5156e 100644
--- a/.reuse/dep5
+++ b/.reuse/dep5
@@ -61,3 +61,7 @@ License: OFL-1.1
 Files: src/librustdoc/html/static/css/normalize.css
 Copyright: Nicolas Gallagher and Jonathan Neal
 License: MIT
+
+Files: src/doc/rustc-dev-guide/mermaid.min.js
+Copyright: Knut Sveidqvist
+License: MIT