diff --git a/.patches/pr-32903.txt b/.patches/pr-32903.txt
new file mode 100644
index 0000000000..a61501edbe
--- /dev/null
+++ b/.patches/pr-32903.txt
@@ -0,0 +1 @@
+Add missing sharing extensions sidebar item in frontend system architecture docs
\ No newline at end of file
diff --git a/microsite/sidebars.ts b/microsite/sidebars.ts
index b3053e3953..cd2dd84b38 100644
--- a/microsite/sidebars.ts
+++ b/microsite/sidebars.ts
@@ -556,6 +556,7 @@ export default {
                 'frontend-system/architecture/extensions',
                 'frontend-system/architecture/extension-blueprints',
                 'frontend-system/architecture/extension-overrides',
+                'frontend-system/architecture/sharing-extensions',
                 'frontend-system/architecture/references',
                 'frontend-system/architecture/utility-apis',
                 'frontend-system/architecture/routes',