diff --git a/doc/greaseweazle.md b/doc/greaseweazle.md
index 417f3df7..753dcbda 100644
--- a/doc/greaseweazle.md
+++ b/doc/greaseweazle.md
@@ -7,15 +7,9 @@ completely open source solution. This requires more work to set up (or you can
 buy a prebuilt GreaseWeazle board), but provides completely open source
 hardware which doesn't require the use of the Cypress Windows-based tools that
 the FluxEngine does. Luckily, the FluxEngine software supports it almost
-out-of-the-box --- just plug it in and nearly everything should work. You will
-need to tell FluxEngine which serial port the GreaseWeazle is plugged
-in with:
-
-```
-fluxengine read ibm -o ibm.img --usb.greaseweazle=/dev/ttyACM3
-```
-
-On Windows, use `COM1`/`COM2`/`COM3` etc for the port.
+out-of-the-box --- just plug it in and nearly everything should work. The
+FluxEngine software will autodetect it. If you have more than one device
+plugged in, use `--usb.serial=` to specify which one you want to use.
 
 I am aware that having _software_ called FluxEngine and _hardware_ called
 FluxEngine makes things complicated when you're not using the FluxEngine client
diff --git a/doc/using.md b/doc/using.md
index e1c68e5e..5cecf464 100644
--- a/doc/using.md
+++ b/doc/using.md
@@ -43,13 +43,14 @@ file while changing the decoder options, to save disk wear. It's also much faste
 
 ### Connecting it up
 
-To use, simply plug your FluxEngine into your computer and run the client. If a
-single device is plugged in, it will be automatically detected and used.
+To use, simply plug your FluxEngine (or [GreaseWeazle](greaseweazle.doc) into
+your computer and run the client. If a single device is plugged in, it will be
+automatically detected and used.
 
 If _more_ than one device is plugged in, you need to specify which one to use
-with the `--usb.fluxengine` parameter, which takes the device serial number as a
+with the `--usb.serial` parameter, which takes the device serial number as a
 parameter.  You can find out the serial numbers by running the command without
-the `--usb.fluxengine` parameter, and if more than one device is attached they will
+the `--usb.serial` parameter, and if more than one device is attached they will
 be listed. The serial number is also shown whenever a connection is made.
 
 You _can_ work with more than one FluxEngine at the same time, using different