diff --git a/lib/VGA_ctrl/todo.txt b/lib/VGA_ctrl/todo.txt
index f82fa48..6a964e3 100644
--- a/lib/VGA_ctrl/todo.txt
+++ b/lib/VGA_ctrl/todo.txt
@@ -2,3 +2,8 @@
 - char_gen.vhdl: add csr_posx_out, csr_posy_out to port. Make it register readable (done 2009-11-04)
 - several async. resets recognized. Sync. resets better?
 - Make screen width, screen height and FPS register readable (done 2009-11-04)
+
+2009-11-08
+Double-buffering to reduce artifacts on buffer write by host and buffer read by VGA master.
+- currently double-buffer can only be updatetd if msten = 0. Buffer updates should be always possible
+  for large screen change, which need more time than one frame.