diff --git a/model/LdapAdapter.php b/model/LdapAdapter.php
index 29e909e..2174a1f 100644
--- a/model/LdapAdapter.php
+++ b/model/LdapAdapter.php
@@ -115,7 +115,7 @@ class LdapAdapter implements LoginAdapter
             return $user;
 
         } else {
-            throw new core_kernel_users_InvalidLoginException();
+            throw new core_kernel_users_InvalidLoginException('User "'.$this->getUsername().'" failed LDAP authentication.');
         }