diff --git a/Middleware/Authen.cs b/Middleware/Authen.cs
index e2d87589..aca0d0bc 100644
--- a/Middleware/Authen.cs
+++ b/Middleware/Authen.cs
@@ -154,6 +154,7 @@ protected override Task HandleChallengeAsync(AuthenticationProperties properties
                 if (value.ToString().ToLower() == "api")
                 {
                     Response.StatusCode = 401;
+                    Response.Headers.Append("WWW-Authenticate", "Basic");
                     return Task.CompletedTask;
                 }
             }
diff --git a/Views/API/Index.cshtml b/Views/API/Index.cshtml
index f817f1e4..3f2d369e 100644
--- a/Views/API/Index.cshtml
+++ b/Views/API/Index.cshtml
@@ -578,6 +578,20 @@
         vehicleId - Id of Vehicle
     </div>
 </div>
+<div class="row api-method">
+    <div class="col-1">
+        <span class="badge bg-success">GET</span>
+    </div>
+    <div class="col-5 copyable">
+        <code>/api/calendar</code>
+    </div>
+    <div class="col-3">
+        Returns reminder calendar in ICS format
+    </div>
+    <div class="col-3">
+        No Params
+    </div>
+</div>
 <div class="row api-method">
     <div class="col-1">
         <span class="badge bg-primary">POST</span>