diff --git a/cura/Scene/BlockSlicingDecorator.py b/cura/Scene/BlockSlicingDecorator.py
index 3fc0015836..0536e1635f 100644
--- a/cura/Scene/BlockSlicingDecorator.py
+++ b/cura/Scene/BlockSlicingDecorator.py
@@ -1,9 +1,12 @@
+# Copyright (c) 2018 Ultimaker B.V.
+# Cura is released under the terms of the LGPLv3 or higher.
+
 from UM.Scene.SceneNodeDecorator import SceneNodeDecorator
 
 
 class BlockSlicingDecorator(SceneNodeDecorator):
-    def __init__(self):
+    def __init__(self) -> None:
         super().__init__()
 
-    def isBlockSlicing(self):
+    def isBlockSlicing(self) -> bool:
         return True