diff --git a/PC_control.md b/PC_control.md
index a141a01..89b5653 100644
--- a/PC_control.md
+++ b/PC_control.md
@@ -1,4 +1,7 @@
 # PC control protocol
+
+COM port setup: 8N1, minimum baudrate of 115200, higher can be better
+
 ## Reporting
 Board periodically sends info about lens in below format:
 ```