diff --git a/README.md b/README.md
index fcc1dae3b84d0f8131cd5e04623df821c41f3e1c..da27ab2c7f78be0b53ef57eec31a7a306076abb4 100644
--- a/README.md
+++ b/README.md
@@ -56,3 +56,10 @@ Use the following command:
 [//]: # Do not add maintainers to cspell-project-words file
 
 * James Wilson - [jwilson3](https://www.drupal.org/u/jwilson3)
+
+## Credits
+
+This theme uses Sass variables and mixins from the
+[Rivet Design System](https://github.com/indiana-university/rivet-source)
+(BSD-3-Clause License) to compile Rivet-compatible custom CSS components,
+but does not redistribute Rivet code.
diff --git a/package.json b/package.json
index cb0002a3d70d628faa8a6734b9346c26fb99ce32..70211566e35e3214c0088589dff0881d6f1dec2f 100644
--- a/package.json
+++ b/package.json
@@ -1,7 +1,7 @@
 {
   "name": "rivet",
   "version": "1.0.0",
-  "license": "BSD-3-Clause",
+  "license": "GPL-2.0+",
   "description": "An implementation of Indiana University's <a href='https://rivet.iu.edu'>Rivet Design System</a> for Drupal.",
   "author": "James Wilson <jrwilson3@gmail.com>",
   "devDependencies": {