diff --git a/registries/_namespace/oai.md b/registries/_namespace/oai.md
new file mode 100644
index 0000000000..5155c4322e
--- /dev/null
+++ b/registries/_namespace/oai.md
@@ -0,0 +1,12 @@
+---
+owner: DarrelMiller
+issue: 
+description: Reserved for uses defined by the OAI
+layout: default
+---
+
+{% capture summary %}
+The `x-{{page.slug}}-` prefix is [reserved](https://spec.openapis.org/oas/v3.1.0.html#specification-extensions) for uses defined by the [OpenAPI Initiative](https://www.openapis.org/).
+{% endcapture %}
+
+{% include namespace-entry.md summary=summary %}
diff --git a/registries/_namespace/oas.md b/registries/_namespace/oas.md
new file mode 100644
index 0000000000..5155c4322e
--- /dev/null
+++ b/registries/_namespace/oas.md
@@ -0,0 +1,12 @@
+---
+owner: DarrelMiller
+issue: 
+description: Reserved for uses defined by the OAI
+layout: default
+---
+
+{% capture summary %}
+The `x-{{page.slug}}-` prefix is [reserved](https://spec.openapis.org/oas/v3.1.0.html#specification-extensions) for uses defined by the [OpenAPI Initiative](https://www.openapis.org/).
+{% endcapture %}
+
+{% include namespace-entry.md summary=summary %}