diff --git a/manifests/init.pp b/manifests/init.pp
index 109b940..aae0a86 100644
--- a/manifests/init.pp
+++ b/manifests/init.pp
@@ -1,103 +1,103 @@
 # == Class: postfix
 #
 # Manage postfix configuration with Debian preseeding
 #
 # === Parameters
 #
 # [*relayhost*]
 #    Set the relayhost for the machine
 #
 # [*root_address*]
 #    Set the forward address for mail sent to root.
 #    Default: '' (keeping the current root alias)
 #
 # [*mailname*]
 #    The default domain for outgoing mail
 #    Default: $::fqdn
 #
 # [*destinations*]
 #    Array of domains for whose the mail is locally delivered
 #    Default: [$::fqdn]
 #
 # [*mynetworks*]
 #    Array of networks from which to accept mail
 #    Default: ['127.0.0.0/8', '[::ffff:127.0.0.0]/104', '[::1]/128'] (only accept local mail)
 #
 # [*relay_destinations*]
 #    Hash of destinations for relayed mail
 #    Default: {} (no relayed mail)
 #    Example: {
 #      'forge.softwareheritage.org' => 'smtp:[tate.internal.softwareheritage.org]'
 #    }
 # === Examples
 #
 #  class { 'postfix':
 #    relayhost => '[smtp.example.com]',
 #  }
 #
 # === Authors
 #
 # Nicolas Dandrimont <nicolas@dandrimont.eu>
 #
 # === Copyright
 #
 # Copyright 2015 Nicolas Dandrimont
 #
 class postfix (
   $relayhost          = undef,
   $root_address       = '',
   $mailname           = $::fqdn,
   $destinations       = [$::fqdn],
   $mynetworks         = ['127.0.0.0/8', '[::ffff:127.0.0.0]/104', '[::1]/128'],
   $relay_destinations = {},
 ){
 
   validate_string($relayhost)
   validate_string($main_mailer_type)
   validate_string($root_address)
   validate_string($mailname)
   assert_type(Array[String], $destinations)
   assert_type(Array[String], $mynetworks)
-  assert_type(Hash[String, String], $transports)
+  assert_type(Hash[String, String], $relay_destinations)
 
   package {'postfix':
     ensure  => present,
   }
 
   service {'postfix':
     ensure  => running,
     enable  => true,
     require => [
       File['/etc/postfix/main.cf'],
       File['/etc/postfix/master.cf'],
       File['/etc/postfix/transport'],
     ],
   }
 
   file {'/etc/postfix/main.cf':
     ensure  => present,
     content => template('postfix/main.cf.erb'),
     notify  => Service['postfix'],
     require => Package['postfix'],
   }
 
   file {'/etc/postfix/master.cf':
     ensure  => present,
     content => template('postfix/master.cf.erb'),
     notify  => Service['postfix'],
     require => Package['postfix'],
   }
 
   file {'/etc/postfix/transport':
     ensure  => present,
     content => template('postfix/transport.erb'),
     notify  => Exec['update transport'],
     require => Package['postfix'],
   }
 
   exec {'update transport':
     path        => ['/usr/bin', '/usr/sbin'],
     command     => 'postmap /etc/postfix/transport',
     refreshonly => true,
   }
 }