diff --git a/IMPLEMENTATIONS.md b/IMPLEMENTATIONS.md
index 29ef9b6d92..7554099f6a 100644
--- a/IMPLEMENTATIONS.md
+++ b/IMPLEMENTATIONS.md
@@ -20,6 +20,9 @@ These tools are not endorsed by the OAI.
 | oas3-remote-refs | [github//OverSpeedIO/oas3-remote-refs](https://github.com/OverSpeedIO/oas3-remote-refs) | Node.js | Tool to pull remote refernences and merge them into the definitions of the provided OpenAPI3 speicfication.
 | go-openapi | [github/nasa9084/go-openapi](https://github.com/nasa9084/go-openapi) | Go | Golang struct model for OpenAPI 3.x. |
 | openapi | [github/wzshiming/openapi](https://github.com/wzshiming/openapi) | Go | OpenAPI 3 Specification for golang |
+| open api spex | [/mbuhot/open_api_spex(https://github.com/mbuhot/open_api_spex)] | Elixir | Leverage OpenApi Specification 3 to document, test, validate and explore your Plug and Phoenix APIs. |
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 #### Editors