1 files changed, 4 insertions, 0 deletions
diff --git a/src/subway_map.h b/src/subway_map.h
index 8b8c6a6..1108cd4 100644
--- a/src/subway_map.h
+++ b/src/subway_map.h

@@ -35,8 +35,10 @@ class SubwayMap : public wxPanel {
  void OnMouseClick(wxMouseEvent &event);
  void OnTimer(wxTimerEvent &event);
  void OnZoomSlide(wxCommandEvent &event);
+  void OnClickHelp(wxCommandEvent &event);
  void Redraw();
+  void SetUpHelpButton();
  wxPoint MapPosToRenderPos(wxPoint pos) const;
  wxPoint MapPosToVirtualPos(wxPoint pos) const;
@@ -70,6 +72,8 @@ class SubwayMap : public wxPanel {
  wxSlider *zoom_slider_;
+  wxButton *help_button_;
  std::optional<wxPoint> mouse_position_;
  struct GetItemBox {