diff --git a/apps/web/src/views/settings.ejs b/apps/web/src/views/settings.ejs
index ecb6746..18a3c0b 100644
--- a/apps/web/src/views/settings.ejs
+++ b/apps/web/src/views/settings.ejs
@@ -10,6 +10,16 @@
 
     <h1 class="text-xl font-semibold text-white">Settings</h1>
 
+    <% if (it.isSubKey) { %>
+    <div class="flex gap-3 items-start bg-blue-950/40 border border-blue-800/40 rounded-xl px-5 py-4">
+      <span class="text-blue-400 text-base mt-0.5">🔑</span>
+      <div>
+        <p class="text-sm font-medium text-blue-300">You're signed in with a sub-key</p>
+        <p class="text-xs text-blue-400/70 mt-1">Sub-keys are scoped API keys that can manage monitors but can't access or change account credentials. To manage your login key, email, or sub-keys, sign in with your main account key.</p>
+      </div>
+    </div>
+    <% } %>
+
     <!-- Account info -->
     <section class="bg-gray-900 rounded-xl border border-gray-800 p-6">
       <h2 class="text-sm font-semibold text-gray-300 mb-4">Account</h2>