diff --git a/backend/lib/controller/channelcontroller.php b/backend/lib/controller/channelcontroller.php
index 988992b..89114f0 100644
--- a/backend/lib/controller/channelcontroller.php
+++ b/backend/lib/controller/channelcontroller.php
@@ -31,7 +31,8 @@ class ChannelController extends Controller {
 	
 	public function add() {
 		$channel = new Channel();
-		$channel->ucid = $ucid;
+		
+		// TODO add ucid generation or exception if no one has been passed via get
 
 		if (substr($channel->ucid, 0, 19) == OneWireSensor::$ucidPrefix) {
 			$channel->type = 'OneWireSensor';
diff --git a/backend/lib/controller/groupcontroller.php b/backend/lib/controller/groupcontroller.php
index 6f426fc..37ea9fd 100644
--- a/backend/lib/controller/groupcontroller.php
+++ b/backend/lib/controller/groupcontroller.php
@@ -25,7 +25,7 @@ class GroupController extends Controller {
 		$group->description = $this->view->request->get['description'];
 		$group->save();
 		
-		// TODO add ugid 
+		// TODO generate ugid 
 		
 		$this->view->addGroup($group);
 	}
diff --git a/backend/lib/controller/usercontroller.php b/backend/lib/controller/usercontroller.php
index 1f37851..b87f215 100644
--- a/backend/lib/controller/usercontroller.php
+++ b/backend/lib/controller/usercontroller.php
@@ -23,6 +23,9 @@ class UserController extends Controller {
 	public function add() {
 		$user = new User();
 		$user->password = $this->view->request->get['password'];
+		
+		// TODO generate uuid
+		
 		$user->save();
 		$this->view->addUser($user);
 	}