diff --git a/site/content/3.12/release-notes/version-3.12/whats-new-in-3-12.md b/site/content/3.12/release-notes/version-3.12/whats-new-in-3-12.md
index 39ffd8435e..549ce3355c 100644
--- a/site/content/3.12/release-notes/version-3.12/whats-new-in-3-12.md
+++ b/site/content/3.12/release-notes/version-3.12/whats-new-in-3-12.md
@@ -179,6 +179,16 @@ section, as well as in the **API** tab of Foxx services and Foxx routes that use
 The new version adds support for OpenAPI 3.x specifications in addition to
 Swagger 2.x compatibility.
 
+---
+
+<small>Introduced in: v3.12.5</small>
+
+Swagger UI has been updated to version 5.21.0.
+
+The default model rendering has been adjusted to display the **Schema** tab with
+an interactive model tree instead of the **Example Value** tab by default. This
+makes it easier to discover the structured request and response body descriptions.
+
 ## External versioning support
 
 Document operations that update or replace documents now support a `versionAttribute` option.
diff --git a/site/content/3.13/release-notes/version-3.12/whats-new-in-3-12.md b/site/content/3.13/release-notes/version-3.12/whats-new-in-3-12.md
index 39ffd8435e..549ce3355c 100644
--- a/site/content/3.13/release-notes/version-3.12/whats-new-in-3-12.md
+++ b/site/content/3.13/release-notes/version-3.12/whats-new-in-3-12.md
@@ -179,6 +179,16 @@ section, as well as in the **API** tab of Foxx services and Foxx routes that use
 The new version adds support for OpenAPI 3.x specifications in addition to
 Swagger 2.x compatibility.
 
+---
+
+<small>Introduced in: v3.12.5</small>
+
+Swagger UI has been updated to version 5.21.0.
+
+The default model rendering has been adjusted to display the **Schema** tab with
+an interactive model tree instead of the **Example Value** tab by default. This
+makes it easier to discover the structured request and response body descriptions.
+
 ## External versioning support
 
 Document operations that update or replace documents now support a `versionAttribute` option.