diff --git a/libraries/AP_HAL_VRBRAIN/HAL_VRBRAIN_Class.cpp b/libraries/AP_HAL_VRBRAIN/HAL_VRBRAIN_Class.cpp
index 16ab0118e4..5a43276aaa 100644
--- a/libraries/AP_HAL_VRBRAIN/HAL_VRBRAIN_Class.cpp
+++ b/libraries/AP_HAL_VRBRAIN/HAL_VRBRAIN_Class.cpp
@@ -49,7 +49,7 @@ static VRBRAINGPIO gpioDriver;
 
 
 
-
+//We only support 3 serials for VRBRAIN at the moment
 #if  defined(CONFIG_ARCH_BOARD_VRBRAIN_V40)
 #define UARTA_DEFAULT_DEVICE "/dev/ttyACM0"
 #define UARTB_DEFAULT_DEVICE "/dev/ttyS1"