diff --git a/README b/README
index ef691ae..94f9f19 100644
--- a/README
+++ b/README
@@ -35,6 +35,7 @@ Use `make` to compile and flash it.
 VLC will send the coloer values over USB, going to the serial UART.
 
 `lib/ws2812b` allow to control WS2812B LED strips.
+The data transmission is done implemented in assembly since it is time critical
 The LED strips are connected in parallel as follows:
 - 11 LEDs on pin D2 (PD2) for the top first LED strip
 - 08 LEDs on pin D3 (PD3) for the top second LED strip
@@ -75,9 +76,13 @@ A example for a white picture is available in `vlc-fnordlicht-dump.txt`
 limitation
 ==========
 
+Don't forget to short the reset pin of the microcontroller with 5V to prevent reset when the serial port is open.
+Else the firmware will miss the start of VLC's communication (the sync) while booting.
+This would make the LED light output garbage.
+
 In the current WS2812B implementation setting an LED colors requires 36 us.
-Outputting the data to the WS2812B strips requires 38 us for a single LED on all pins/strips in parallel.
-For 11 LEDs per strip is requires 368 us.
+Outputting the data to the WS2812B strips requires 48 us for a single LED on all pins/strips in parallel.
+For 11 LEDs per strip is requires 348 us.
 
 The fnordlicht protocol uses a baud rate of 19200 bps with 8N1 configuration.
 Thus sending/receiving one byte requires 1.0s/(19200bps/(8+1)bits)= 469 us.