diff --git a/README.md b/README.md
index e4bdb4d85b632..6a9a2a69d7367 100644
--- a/README.md
+++ b/README.md
@@ -6,6 +6,7 @@
 - [Security](#security)
 - [License](#license)
 - [Copyright](#copyright)
+- [Trademark](#trademark)
 
 ## Welcome!
 
@@ -39,3 +40,9 @@ This project is licensed under the [Apache v2.0 License](LICENSE.txt).
 ## Copyright
 
 Copyright OpenSearch Contributors. See [NOTICE](NOTICE.txt) for details.
+
+## Trademark
+
+OpenSearch is a registered trademark of Amazon Web Services.
+
+OpenSearch includes certain Apache-licensed Elasticsearch code from Elasticsearch B.V. and other source code. Elasticsearch B.V. is not the source of that other source code. ELASTICSEARCH is a registered trademark of Elasticsearch B.V.
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