diff --git a/poincare/include/poincare/tree_node.h b/poincare/include/poincare/tree_node.h
index b963e32df..f2e789f12 100644
--- a/poincare/include/poincare/tree_node.h
+++ b/poincare/include/poincare/tree_node.h
@@ -74,6 +74,7 @@ public:
   // AddChild collateral effect
   virtual void didAddChildAtIndex(int newNumberOfChildren) {}
 
+  // FIXME: do we need the Template? Do we need the iterator?
   template <typename T>
   class Iterator {
     public: