diff --git a/lib/admin/Controller/subscriber.pm b/lib/admin/Controller/subscriber.pm
index b3b8edb..4adf9f9 100644
--- a/lib/admin/Controller/subscriber.pm
+++ b/lib/admin/Controller/subscriber.pm
@@ -219,6 +219,10 @@ sub update_subscriber : Local {
         $messages{domain} = 'Client.Syntax.MalformedDomain' unless($checkresult);
     }
 
+    if(defined $c->request->params->{external_id}) {
+        $settings{external_id} = $c->request->params->{external_id};
+    }
+
     $settings{admin} = 1 if $c->request->params->{admin};
 
     my $password = $c->request->params->{password};
diff --git a/root/tt/subscriber_detail.tt b/root/tt/subscriber_detail.tt
index 11085f3..384f756 100644
--- a/root/tt/subscriber_detail.tt
+++ b/root/tt/subscriber_detail.tt
@@ -69,6 +69,17 @@
             <ul class="cleanlist">
               <li class="ui-state-default"><div class="span-5">Subscriber ID:</div><div class="span-11 last">[% subscriber.subscriber_id %]</div></li>
               <li class="ui-state-default"><div class="span-5">Contract ID:</div><div class="span-11 last"><a href="/account/detail?account_id=[% subscriber.account_id || account_id %]">[% subscriber.account_id || account_id %]</a></div></li>
+              <li class="ui-state-default">
+                <div class="span-5">External ID:</div>
+                <div class="span-11 last">
+                [% IF edit_subscriber %]
+                  <input type="text" name="external_id" value="[% subscriber.external_id %]"
+                         title="the unique external ID of the subscriber, string, optional" />
+                [% ELSE %]
+                  [% subscriber.external_id %]
+                [% END %]
+                </div>
+              </li>
               <li class="ui-state-default">
                 <div class="span-5">Web User:</div>
                 <div class="span-11 last">