diff --git a/README.md b/README.md
index 6c72ccf..6c6f324 100644
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+++ b/README.md
@@ -66,6 +66,8 @@ A curated list of resources for ActivityPub developers who create software for t
 
 * [**ActivityPub HTTP Signatures**](https://gitlab.com/paulkiddle/activitypub-http-signatures) ([Fedi account](https://kith.kitchen/@paul)): A library for creating, parsing, and verifying HTTP signature headers, as per the Signing HTTP Messages draft 80 specification. `ISC, Javascript`
 
+* [**ActivityPub Kotlin**](https://github.com/0xZhangKe/ActivityPub-Kotlin): Kotlin implementation of ActivityPub. `Apache-2.0, Kotlin`
+
 * [**ActivityPub Minimal Core**](https://github.com/steve-bate/activitypub-mincore): An exploration into an ActivityPub Minimal Core. `MIT, Python`
 
 * [**ActivityPub-PHP**](https://github.com/pterotype-project/activitypub-php) ([Fedi account](https://mastodon.technology/@jdormit)): A PHP implementation of the ActivityPub protocol (used in Pterotype plugin).  `MIT, PHP`