diff --git a/src/content/docs/release-notes/v4.0.0.md b/src/content/docs/release-notes/v4.0.0.md
new file mode 100644
index 00000000..29269320
--- /dev/null
+++ b/src/content/docs/release-notes/v4.0.0.md
@@ -0,0 +1,66 @@
+---
+title: v4.0.0
+---
+
+Major technical infrastructure upgrades and user interface improvements characterize this release. The following sections detail the major changes brought about by v4.0.0.
+
+## Major Infrastructure Updates
+
+- Upgraded to newer versions of:
+  - Bootstrap
+  - jQuery
+  - Rails
+  - JRuby
+  - Jetty (replaced with Puma)
+  - Nokogiri
+  - Sequel
+- Staff application CSS migrated from Less to Sass
+- Java 8 no longer supported - requires Java 11 or 17
+- Solr v9 now required
+- Docker now supported as recommended deployment method
+
+## Public Interface Improvements
+
+- Collection organization sidebar can now be configured for left/right positioning
+- Option to load all children for a resource at once (vs infinite scroll)
+- Search terms now highlighted in results
+- Fixed bug causing extra lines in notes display
+- Fixed PDF icon label
+- Improved hyperlink display in classification descriptions
+
+## Staff Interface Enhancements
+
+- Bulk updater plugin now part of core application
+- New ability to duplicate full resource or archival object records
+- Enhanced spreadsheet importers
+- New option to download partially completed digital object spreadsheet template
+- Fixed agent merge preview page
+- Improved staff plugins dropdown in repository settings
+- Fixes to the Rapid Data Entry modal
+- Fixed tooltip bugs
+- Improved Jobs status layouts
+
+## Documentation & Testing
+
+- Launched new technical documentation site at docs.archivesspace.org
+- Ported all Selenium tests to Capybara
+- Added functionality for test failure screenshots
+
+## API & Integration Updates
+
+- OAI identifiers now use colon separator instead of slash
+- **Breaking change**: OAI URIs format updated to conform with OAI-PMH guidelines
+
+## Security & Administration
+
+- New option to allow system administrators to access system information page
+- Added configuration for favicon display
+- Improved error messages for PDF generation
+- Enhanced bulk import/update capabilities with new configuration options
+
+## Community Contributions
+
+- 76 community contributions accepted
+- 134 Pull Requests merged
+- 146 Jira Tickets closed
+- Contributions from multiple community members and organizations
diff --git a/src/siteNavigation.json b/src/siteNavigation.json
index 09a4975a..eb866b40 100644
--- a/src/siteNavigation.json
+++ b/src/siteNavigation.json
@@ -107,6 +107,14 @@
     "label": "API",
     "slug": "api"
   },
+  {
+    "label": "Release Notes",
+    "collapsed": true,
+    "autogenerate": {
+      "directory": "release-notes",
+      "sort": "asc"
+    }
+  },
   {
     "label": "About Tech Docs",
     "collapsed": true,