diff --git a/registries/_namespace/jsonschema.md b/registries/_namespace/jsonschema.md
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+++ b/registries/_namespace/jsonschema.md
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+---
+owner: OAI
+issue:
+description: JSON Schema keywords exposed as OpenAPI Specification Extensions for versions that do not directly support them.
+layout: default
+registry: ../extension/index.html
+---
+
+{% capture summary %}
+The `x-{{page.slug}}-` prefix is reserved for OpenAPI Specification Extensions that mirror JSON Schema keywords when targeting OpenAPI versions or JSON Schema dialects where those keywords are not directly available.
+
+Extensions in this namespace are registered in the [OpenAPI Extension Registry](../extension/), like the `x-oai-` and `x-oas-` namespaces.
+{% endcapture %}
+
+{% include namespace-entry.md summary=summary %}