diff --git a/config.inc.php.example b/config.inc.php.example
index 23a2ad8..dad6155 100644
--- a/config.inc.php.example
+++ b/config.inc.php.example
@@ -33,6 +33,9 @@ $sitename           = 'SemanticScuttle';
 $welcomeMessage     = 'More than tags...';
 # locale:           The locale used (list ./locales : de_DE  en_GB  fr_FR  it_IT  lt_LT nl_NL  zh_CN dk_DK  es_ES  hi_IN  ja_JP  pt_BR)
 $locale             = 'en_GB';
+# admin users:
+# add users as admin by: $admins = array('adminnickname', 'user1nick', 'user2nick');
+$admin_users = array();
 
 ### display templates ###
 # top_include:      The header file.
diff --git a/services/userservice.php b/services/userservice.php
index 381ae51..c691b36 100644
--- a/services/userservice.php
+++ b/services/userservice.php
@@ -133,7 +133,14 @@ class UserService {
     }
 
     function isAdmin($userid) {
-        return false; //not implemented yet
+	$user = $this->getUser($userid);
+	
+	if(isset($GLOBALS['admin_users'])
+		&& in_array($user['username'], $GLOBALS['admin_users'])) {
+	    return true;
+	} else {
+	    return false;
+	}
     }
 
     function getCurrentUserId() {