diff --git a/openapi.yaml b/openapi.yaml
index c7508b5..4969c24 100644
--- a/openapi.yaml
+++ b/openapi.yaml
@@ -7,6 +7,8 @@ info:
     REST API for managing Open Graph, SEO meta, and structured-data tags in
     Joomla via the MokoSuiteOpenGraph extension.
 
+    **Requires Joomla 6.0 or higher.**
+
     The API follows Joomla's Web Services conventions and returns responses in
     [JSON:API](https://jsonapi.org/) format. All endpoints require
     authentication via a Joomla API token.