diff --git a/CMakeLists.txt b/CMakeLists.txt
index 5210f1e..37d543e 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -158,6 +158,7 @@ target_sources(nf7
     file/gl_obj.cc
     file/luajit_context.cc
     file/luajit_node.cc
+    file/node_comment.cc
     file/node_exprtk.cc
     file/node_mutex.cc
     file/node_network.cc
diff --git a/file/node_comment.cc b/file/node_comment.cc
new file mode 100644
index 0000000..3cd0d38
--- /dev/null
+++ b/file/node_comment.cc
@@ -0,0 +1,112 @@
+#include <memory>
+#include <string>
+#include <typeinfo>
+#include <utility>
+
+#include <imgui.h>
+#include <imgui_stdlib.h>
+
+#include <yas/serialize.hpp>
+#include <yas/types/std/string.hpp>
+#include <yas/types/utility/usertype.hpp>
+
+#include "nf7.hh"
+
+#include "common/file_base.hh"
+#include "common/generic_memento.hh"
+#include "common/generic_type_info.hh"
+#include "common/memento.hh"
+#include "common/node.hh"
+#include "common/ptr_selector.hh"
+
+
+namespace nf7 {
+namespace {
+
+class Comment final : public nf7::FileBase, public nf7::Node {
+ public:
+  static inline const nf7::GenericTypeInfo<Comment> kType = {
+    "Node/Comment", {"nf7::Node",},
+    "adds comments for your future",
+  };
+
+  struct Data {
+    std::string text;
+
+    void serialize(auto& ar) {
+      ar(text);
+    }
+  };
+
+  Comment(nf7::Env& env, Data&& d = {}) noexcept :
+      nf7::FileBase(kType, env),
+      nf7::Node(nf7::Node::kCustomNode),
+      mem_(*this, std::move(d)) {
+  }
+
+  Comment(nf7::Deserializer& ar) : Comment(ar.env()) {
+    ar(mem_.data());
+  }
+  void Serialize(nf7::Serializer& ar) const noexcept override {
+    ar(mem_.data());
+  }
+  std::unique_ptr<nf7::File> Clone(nf7::Env& env) const noexcept override {
+    return std::make_unique<Comment>(env, Data {mem_.data()});
+  }
+
+  std::shared_ptr<nf7::Node::Lambda> CreateLambda(
+      const std::shared_ptr<nf7::Node::Lambda>& parent) noexcept override {
+    return std::make_shared<nf7::Node::Lambda>(*this, parent);
+  }
+  nf7::Node::Meta GetMeta() const noexcept override {
+    return {{}, {}};
+  }
+
+  void UpdateNode(nf7::Node::Editor&) noexcept override;
+  void UpdateMenu(nf7::Node::Editor&) noexcept override;
+
+  nf7::File::Interface* interface(const std::type_info& t) noexcept override {
+    return nf7::InterfaceSelector<nf7::Memento, nf7::Node>(t).Select(this, &mem_);
+  }
+
+ private:
+  nf7::GenericMemento<Data> mem_;
+
+
+  void Editor() noexcept;
+};
+
+void Comment::UpdateNode(nf7::Node::Editor&) noexcept {
+  ImGui::TextUnformatted("Node/Comment");
+  ImGui::SameLine();
+  if (ImGui::SmallButton("edit")) {
+    ImGui::OpenPopup("Editor");
+  }
+  ImGui::Spacing();
+  ImGui::Indent();
+  ImGui::TextUnformatted(mem_->text.c_str());
+  ImGui::Unindent();
+
+  if (ImGui::BeginPopup("Editor")) {
+    Editor();
+    ImGui::EndPopup();
+  }
+}
+void Comment::UpdateMenu(nf7::Node::Editor&) noexcept {
+  if (ImGui::BeginMenu("edit")) {
+    Editor();
+    ImGui::EndMenu();
+  }
+}
+
+void Comment::Editor() noexcept {
+  const auto em = ImGui::GetFontSize();
+
+  ImGui::InputTextMultiline("##text", &mem_->text, ImVec2 {16*em, 4*em});
+  if (ImGui::IsItemDeactivatedAfterEdit()) {
+    mem_.Commit();
+  }
+}
+
+}
+}  // namespace nf7