diff --git a/README.md b/README.md
index 90378b7..e76b973 100644
--- a/README.md
+++ b/README.md
@@ -47,7 +47,7 @@ In Arduino IDE you have to select board. On my case some reason "Arduino Leonard
 
 - Tools->Port->COMx
 
-In Windows Arduino IDE shows only available com-ports. In most cases it's biggest numbered COM-port. COM-port number can change when you start to upload program first time (COM-port number can be different after joystick-features are enabled). If this happens, just change COM-port and start upload again. When I tested with RetrOrangePi (Raspbian Linux), port was ttyACM0.
+Arduino IDE shows available COM-ports. In most cases it's biggest numbered COM-port. COM-port number can change when you start to upload program first time (COM-port number can be different after joystick-features are enabled). If this happens, just change COM-port and start upload again. When I tested with RetrOrangePi (Raspbian Linux), port was ttyACM0.
 
 - Test your programming environment and upload