diff --git a/boards/bluepill/doc.txt b/boards/bluepill/doc.txt
index 7935635c86..441e4eafaa 100644
--- a/boards/bluepill/doc.txt
+++ b/boards/bluepill/doc.txt
@@ -79,6 +79,7 @@ flash or use this [stlink fork][caboStlink] which has a
 ## Connecting via Serial
 
 The default UART port used is UART2, which uses pins A2 (TX) and A3 (RX).
+To use it, configure your UART to operate at a baudrate of 115200/8N1.
 
 ## Using PWM