diff --git a/README.md b/README.md
index 5aeddc3f1..a08c0749d 100644
--- a/README.md
+++ b/README.md
@@ -505,6 +505,7 @@ The `asdf` core provides a [security policy](https://github.com/asdf-vm/asdf/sec
 | okta-aws-cli                  | [bennythejudge/asdf-plugin-okta-aws-cli](https://github.com/bennythejudge/asdf-plugin-okta-aws-cli)             | [![Build Status](https://github.com/bennythejudge/asdf-plugin-okta-aws-cli/actions/workflows/build.yml/badge.svg)](https://github.com/bennythejudge/asdf-plugin-okta-aws-cli)                                                     |
 | Okteto                        | [BradenM/asdf-okteto](https://github.com/BradenM/asdf-okteto)                                                   | [![Build Status](https://github.com/BradenM/asdf-okteto/workflows/Build/badge.svg?branch=master)](https://github.com/BradenM/asdf-okteto/actions)                                                                                 |
 | om                            | [vmware-tanzu/tanzu-plug-in-for-asdf](https://github.com/vmware-tanzu/tanzu-plug-in-for-asdf)                   | [![Build Status](https://github.com/vmware-tanzu/tanzu-plug-in-for-asdf/actions/workflows/test-om.yml/badge.svg?branch=main)](https://github.com/vmware-tanzu/tanzu-plug-in-for-asdf/actions/workflows/test-om.yml)               |
+| Onyx                          | [jtakakura/asdf-onyx](https://github.com/jtakakura/asdf-onyx)                                                   | [![Build Status](https://github.com/jtakakura/asdf-onyx/workflows/Build/badge.svg)](https://github.com/jtakakura/asdf-onyx/actions?query=workflow%3ABuild)                                                                        |
 | OPA                           | [tochukwuvictor/asdf-opa](https://github.com/tochukwuvictor/asdf-opa)                                           | [![Build status](https://github.com/tochukwuvictor/asdf-opa/workflows/Build/badge.svg?branch=main)](https://github.com/tochukwuvictor/asdf-opa/actions)                                                                           |
 | Opam                          | [asdf-community/asdf-opam](https://github.com/asdf-community/asdf-opam)                                         | [![Build status](https://github.com/asdf-community/asdf-opam/workflows/Main%20workflow/badge.svg?branch=master)](https://github.com/asdf-community/asdf-opam/actions)                                                             |
 | openfaas-faas-cli             | [zekker6/asdf-faas-cli](https://github.com/zekker6/asdf-faas-cli)                                               | [![Build Status](https://github.com/zekker6/asdf-faas-cli/actions/workflows/test.yml/badge.svg)](https://github.com/zekker6/asdf-faas-cli/actions/workflows/test.yml)                                                             |
diff --git a/plugins/onyx b/plugins/onyx
new file mode 100644
index 000000000..ae07c723a
--- /dev/null
+++ b/plugins/onyx
@@ -0,0 +1 @@
+repository = https://github.com/jtakakura/asdf-onyx