diff --git a/README.md b/README.md
index b773cb4..8961665 100644
--- a/README.md
+++ b/README.md
@@ -194,4 +194,6 @@ Test the prototype.
     [x] power decoupling capacitors for ESP32 and OLED
     [x] Connect switching power supply jumpers
     [ ] every 1-2 seconds there are clicks at analog audio output
-    [x] 3.6V zener diodes must be on FPGA side
\ No newline at end of file
+    [x] 3.6V zener diodes must be on FPGA side
+    [ ] power output header: GND 1.1V 2.5V 3.3V 5V output
+    [ ] can esp32 second tx/rx port make serial communication with FPGA