diff --git a/libraries/AP_HAL_Linux/HAL_Linux_Class.cpp b/libraries/AP_HAL_Linux/HAL_Linux_Class.cpp
index 41926347c2..2715ec72f0 100644
--- a/libraries/AP_HAL_Linux/HAL_Linux_Class.cpp
+++ b/libraries/AP_HAL_Linux/HAL_Linux_Class.cpp
@@ -61,7 +61,7 @@ static UtilRPI utilInstance;
 static Util utilInstance;
 #endif
 
-// 3 serial ports on Linux for now
+// 5 serial ports on Linux
 static UARTDriver uartADriver(true);
 static UARTDriver uartCDriver(false);
 static UARTDriver uartDDriver(false);