diff --git a/docs/Serial.md b/docs/Serial.md
index 0347083418..9da5632ca4 100644
--- a/docs/Serial.md
+++ b/docs/Serial.md
@@ -47,13 +47,14 @@ To make configuration easier common usage scenarios are listed below.
 9   SMARTPORT TELEMETRY ONLY
 ```
 
-### Contraints
+### Constraints
 
 * There must always be a port available to use for MSP
 * There must always be a port available to use for CLI
 * To use a port for a function, the function's corresponding feature must be enabled first.
 e.g. to use GPS enable the GPS feature.
 * If the configuration is invalid the serial port configuration will reset to it's defaults and features may be disabled.
+* If softserial is used be aware that both softserial ports must use the same baudrate.
 
 ### Examples