diff --git a/README.md b/README.md
index 73b0558..876dc94 100644
--- a/README.md
+++ b/README.md
@@ -50,6 +50,10 @@ PCB rev 1:
 * R227 -> 470 ohm
 * R228 -> 4.7k
 * review values of R226 and R113
+* use crystal type recommended by the MCU datasheet
+* fix filament voltage protection threshold
+* 22k FBI current resistor -> 10k?
+* add connector for OLED display? 
 
 License
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