diff --git a/debian/copyright b/debian/copyright
index c8546bbcd7..9c112aeabd 100644
--- a/debian/copyright
+++ b/debian/copyright
@@ -21,6 +21,11 @@ Files: vendor/gitignore
 Copyright: Github, Inc
 License: CC0-1.0
 
+Files: vendor/assets/stylesheets/xterm/xterm.css
+Copyright: 2014-2016, SourceLair Private Company (www.sourcelair.com (MIT License)
+           2012-2013, Christopher Jeffrey
+License: Expat
+
 Files: app/assets/fonts/*
 Copyright: 2010, 2012, 2014 Adobe Systems Incorporated (http://www.adobe.com/)
 License: OFL