link back to our release note about mu-plugin

source/releasenotes/2024-03-26-wordpress-6-5.md

@@ -11,6 +11,7 @@ The latest version of WordPress, [6.5 (release name)](), became available on Pan
 <strong>Font Library</strong>
 
 * WordPress 6.5 introduces the new [Font Library](https://make.wordpress.org/core/2024/03/14/new-feature-font-library/). This feature allows you to upload fonts to your WordPress site or install any of the fonts available from Google's font library.
+* Previously, in [version 1.3.3 of our Pantheon MU Plugin](/release-notes/2024/03/pantheon-mu-plugin-1-3-3), we added support for the new Font Library feature by explicitly defining where fonts are stored to support this new feature.
 * For more information, refer to our [documentation](/guides/wordpress-configurations/wordpress-font-library).
 
 <strong>Interactivity API</strong>