diff --git a/README.md b/README.md
index 9113464d..47baa452 100644
--- a/README.md
+++ b/README.md
@@ -1599,6 +1599,7 @@ _Related: [Booking and Scheduling](#booking-and-scheduling)_
 - [Jina](https://github.com/jina-ai/jina/) - Cloud-native neural search framework for any kind of data. `Apache-2.0` `Python`
 - [librengine](https://github.com/liameno/librengine) - Private web search engine. `GPL-3.0` `C++`
 - [MeiliSearch](https://meilisearch.com) - Ultra relevant, instant and typo-tolerant full-text search API. ([Source Code](https://github.com/meilisearch/MeiliSearch)) `MIT` `Rust`
+- [OpenSearch](https://opensearch.org) - Open source distributed and RESTful search engine. ([Source Code](https://github.com/opensearchproject/opensearch)) `Apache-2.0` `Java`
 - [Searx](https://searx.github.io/searx/) - Privacy-respecting, hackable metasearch engine. ([Demo](https://searx.space/), [Source Code](https://github.com/searx/searx)) `AGPL-3.0` `Python`
 - [sist2](https://github.com/simon987/sist2) - Lightning-fast file system indexer and search tool. ([Demo](https://sist2.simon987.net/)) `GPL-3.0` `C`
 - [Typesense](https://typesense.org) - Blazing fast, typo-tolerant open source search engine optimized for developer happiness and ease of use. ([Source Code](https://github.com/typesense/typesense)) `GPL-3.0` `C++`