diff --git a/Tutorial/README.md b/Tutorial/README.md
index 87bc669..f068ee8 100644
--- a/Tutorial/README.md
+++ b/Tutorial/README.md
@@ -3,3 +3,8 @@
 Simple 1-joystick Atari adapter for learning purposes.
 
 Easy to modify to your own DIY-joystick (like arcade cabinet) which based on on/off-switches.
+
+There is also keyboard version, which acts like USB keyboard.
+
+### Notice
+If you program Arduino sometimes to keyboard and sometimes to joystick, COM-port might change in Windows. Just select new COM-port and upload again.