diff --git a/templates/signin.tmpl b/templates/signin.tmpl
index fc2edca..fb14a66 100644
--- a/templates/signin.tmpl
+++ b/templates/signin.tmpl
@@ -2,7 +2,7 @@
 <div class="page-title"> Signin </div>
 
 <form class="signin-form" action="/signin" method="post">
-	<input type="text" name="instance" placeholder="instance">
+	<input type="text" name="instance" placeholder="instance" required>
 	<br>
 	<button type="submit"> Submit </button>
 </form>