diff --git a/lib/VGA_ctrl/sim/tb_vga_frontend64.wdo b/lib/VGA_ctrl/sim/tb_vga_frontend64.wdo
index af67c73..4ab76bc 100644
--- a/lib/VGA_ctrl/sim/tb_vga_frontend64.wdo
+++ b/lib/VGA_ctrl/sim/tb_vga_frontend64.wdo
@@ -39,10 +39,11 @@ add wave -noupdate -format Literal /tb_vga_frontend64/inst_vga_frontend64/s
 add wave -noupdate -format Literal /tb_vga_frontend64/inst_vga_frontend64/request_cnt
 add wave -noupdate -format Literal /tb_vga_frontend64/inst_vga_frontend64/read_cnt
 add wave -noupdate -format Logic /tb_vga_frontend64/inst_vga_frontend64/vga_master_en
-add wave -noupdate -format Literal -radix hexadecimal /tb_vga_frontend64/inst_vga_frontend64/vga_mem_off_last
-add wave -noupdate -format Literal -radix hexadecimal /tb_vga_frontend64/inst_vga_frontend64/vga_mem_off_curr
-add wave -noupdate -format Literal -radix hexadecimal /tb_vga_frontend64/inst_vga_frontend64/vga_mem_off_0
-add wave -noupdate -format Literal -radix hexadecimal /tb_vga_frontend64/inst_vga_frontend64/vga_mem_off_1
+add wave -noupdate -format Literal -radix hexadecimal /tb_vga_frontend64/inst_vga_frontend64/vga_fb_back
+add wave -noupdate -format Literal -radix hexadecimal /tb_vga_frontend64/inst_vga_frontend64/vga_fb_front
+add wave -noupdate -format Literal -radix hexadecimal /tb_vga_frontend64/inst_vga_frontend64/host_fb_front
+add wave -noupdate -format Literal -radix hexadecimal /tb_vga_frontend64/inst_vga_frontend64/host_fb_back
+add wave -noupdate -format Logic /tb_vga_frontend64/inst_vga_frontend64/host_fb_back_we
 add wave -noupdate -divider FIFO
 add wave -noupdate -format Logic /tb_vga_frontend64/inst_vga_frontend64/fifo_full
 add wave -noupdate -format Logic /tb_vga_frontend64/inst_vga_frontend64/fifo_empty
@@ -68,7 +69,7 @@ add wave -noupdate -format Logic /tb_vga_frontend64/inst_vga_frontend64/cg_en
 add wave -noupdate -format Logic /tb_vga_frontend64/inst_vga_frontend64/inst_vga_backend/hready
 add wave -noupdate -format Logic /tb_vga_frontend64/inst_vga_frontend64/inst_vga_backend/vready
 TreeUpdate [SetDefaultTree]
-WaveRestoreCursors {{Cursor 1} {5285815373 ps} 0}
+WaveRestoreCursors {{Cursor 1} {11082527400 ps} 0}
 configure wave -namecolwidth 150
 configure wave -valuecolwidth 100
 configure wave -justifyvalue left
diff --git a/lib/VGA_ctrl/todo.txt b/lib/VGA_ctrl/todo.txt
index 7cc2cc4..594d62b 100644
--- a/lib/VGA_ctrl/todo.txt
+++ b/lib/VGA_ctrl/todo.txt
@@ -6,5 +6,5 @@
 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.
+  for large screen change, which need more time than one frame. (done 2009-11-08)
 - VGA-INT every n-th buffer change?