diff --git a/vtk/src/layers/Layer.cpp b/vtk/src/layers/Layer.cpp
index 6b7bb56..39073b1 100644
--- a/vtk/src/layers/Layer.cpp
+++ b/vtk/src/layers/Layer.cpp
@@ -9,8 +9,9 @@ vtkSmartPointer<vtkRenderer> Layer::getLayer() {
 }
 
 void Layer::updateData(int t) {
+  // By default, do nothing
 }
 
 void Layer::addObservers(vtkSmartPointer<vtkRenderWindowInteractor> interactor) {
-    // By default, do nothing.
+    // By default, do nothing
 }