diff --git a/sass/style.scss b/sass/style.scss
index 9556e63f..dfc4d525 100644
--- a/sass/style.scss
+++ b/sass/style.scss
@@ -14,6 +14,7 @@ This theme, like WordPress, is licensed under the GPL.
 Use it to make something cool, have fun, and share what you've learned with others.
 
 _s is based on Underscores http://underscores.me/, (C) 2012-2015 Automattic, Inc.
+Underscores is distributed under the terms of the GNU GPL v2 or later.
 
 Normalizing styles have been helped along thanks to the fine work of
 Nicolas Gallagher and Jonathan Neal http://necolas.github.com/normalize.css/
diff --git a/style.css b/style.css
index 96667ab0..8fda7701 100644
--- a/style.css
+++ b/style.css
@@ -14,6 +14,7 @@ This theme, like WordPress, is licensed under the GPL.
 Use it to make something cool, have fun, and share what you've learned with others.
 
 _s is based on Underscores http://underscores.me/, (C) 2012-2015 Automattic, Inc.
+Underscores is distributed under the terms of the GNU GPL v2 or later.
 
 Normalizing styles have been helped along thanks to the fine work of
 Nicolas Gallagher and Jonathan Neal http://necolas.github.com/normalize.css/