diff --git a/ATTRIBUTION.md b/ATTRIBUTION.md
index 6d745a1fc3..bb522f4b0f 100644
--- a/ATTRIBUTION.md
+++ b/ATTRIBUTION.md
@@ -21,3 +21,4 @@ FairEmail uses:
 * [Bouncy Castle](https://www.bouncycastle.org/). Copyright (c) 2000 - 2019 The Legion of the Bouncy Castle Inc. [MIT License](https://www.bouncycastle.org/licence.html).
 * [AppAuth for Android](https://github.com/openid/AppAuth-Android). Copyright 2015 The AppAuth for Android Authors. All Rights Reserved. [Apache License 2.0](https://github.com/openid/AppAuth-Android/blob/master/LICENSE).
 * [JCharset](http://www.freeutils.net/source/jcharset/). Copyright (C) 1989, 1991 Free Software Foundation, Inc. [GNU General Public License](http://www.freeutils.net/source/jcharset/#license).
+* [Material design icons](https://github.com/google/material-design-icons). Copyright ???. [Apache license version 2.0](https://github.com/google/material-design-icons#user-content-license).