diff --git a/api/routes/admin.js b/api/routes/admin.js
index f52b46a..59ea907 100644
--- a/api/routes/admin.js
+++ b/api/routes/admin.js
@@ -27,9 +27,9 @@ router.get('/users', async (req, res) => {
 // Update a user's tier
 router.put('/users/:id/tier', async (req, res) => {
     const { id } = req.params;
-    const { role } = req.body; // 'free', 'pro', 'enterprise'
+    const { role } = req.body; // 'free', 'pro', 'enterprise', 'admin'
 
-    if (!['free', 'pro', 'enterprise'].includes(role)) {
+    if (!['free', 'pro', 'enterprise', 'admin'].includes(role)) {
         return res.status(400).json({ error: 'Invalid role specified' });
     }