diff --git a/sources/reactphysics3d/physics/Kilogram.h b/sources/reactphysics3d/physics/Kilogram.h
index 861bbf9a..c9fa5622 100644
--- a/sources/reactphysics3d/physics/Kilogram.h
+++ b/sources/reactphysics3d/physics/Kilogram.h
@@ -23,6 +23,8 @@
  // Libraries
  #include <stdexcept>
 
+ // TODO : Remove the kilogram class
+
  // Namespace ReactPhysics3D
  namespace reactphysics3d {