diff --git a/conf/default.conf.php b/conf/default.conf.php
index b82fea4590..64ffefd802 100644
--- a/conf/default.conf.php
+++ b/conf/default.conf.php
@@ -554,6 +554,11 @@ return array(
   // but rejects "joe@mail.yourcompany.com".
   'auth.email-domains' => array(),
 
+  // You can provide an arbitrary block of HTML here, which will appear on the
+  // login screen. Normally, you'd use this to provide login or registration
+  // instructions to users.
+  'auth.login-message' => null,
+
 
 // -- Accounts -------------------------------------------------------------- //
 
diff --git a/src/applications/auth/controller/PhabricatorLoginController.php b/src/applications/auth/controller/PhabricatorLoginController.php
index 2af18468dc..a21114eb87 100644
--- a/src/applications/auth/controller/PhabricatorLoginController.php
+++ b/src/applications/auth/controller/PhabricatorLoginController.php
@@ -283,9 +283,12 @@ final class PhabricatorLoginController
       $panel->appendChild('<br />');
     }
 
+    $login_message = PhabricatorEnv::getEnvConfig('auth.login-message');
+
     return $this->buildStandardPageResponse(
       array(
         $error_view,
+        $login_message,
         $panel,
       ),
       array(