diff --git a/src/widget/state.c b/src/widget/state.c
index 478a4d3..375a6ba 100644
--- a/src/widget/state.c
+++ b/src/widget/state.c
@@ -83,6 +83,43 @@ static GtkBox *rec_ZOOM_box()
   return ZOOM_box;
 }
 
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+/* in graphics.h : struct graphics_stack_t { int id;  int mode;...}
+ *                 extern struct graphics_stack_t *graphics_stack;
+ * in init.c :     struct graphics_stack_t *graphics_stack = NULL;
+ *                 graphics_stack = g_malloc0 (sizeof(struct graphics_stack_t));
+ *                 graphics_stack = g_realloc (graphics_stack,
+                                               ++graphics_stack_size *
+                                               sizeof(struct graphics_stack_t));
+ *                 memset (&graphics_stack[cur_id], 0,
+ *                         sizeof(struct graphics_stack_t));
+*/
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 #define n_objects 32
 static GtkScrollbar *object_bar [n_objects];
 static GtkAdjustment *adjust_bar [n_objects];