diff --git a/README.md b/README.md
index f5039abd5..041dc0c42 100644
--- a/README.md
+++ b/README.md
@@ -67,3 +67,5 @@ See the [CONTRIBUTING.md](CONTRIBUTING.md) file for more information.
 
 OpenThread is released under the [BSD 3-Clause license](LICENSE).
 See the [LICENSE](LICENSE) file for more information.
+
+Please only use the OpenThread name and marks when accurately referencing this software distribution, and do not use these marks in a way that suggests you are endorsed by or otherwise affiliated with Nest, Google, or The Thread Group.