diff --git a/dmctl.md b/dmctl.md
index e839b2e..cee4239 100644
--- a/dmctl.md
+++ b/dmctl.md
@@ -1,5 +1,7 @@
 `dmctl` is the host-side utility for configuring the device at runtime. It can be used to query device info, switch to another mode, or perform a few mode-specific commands.
 
+Communicating these commands happens over the USB vendor interface.
+
 ### General usage
 
 The `dmctl.sh` script can be found in the `host/` directory in the source tree.
@@ -32,6 +34,10 @@ subcommands:
                    SUMP logic analyzer overclock settings
 ```
 
+### Connecting to a device
+
+While it is possible to have `dmctl` connect directly to a USB device (using `--conn vid:pid` or `--conn bus.dev`), having the kernel module loaded will keep the USB vendor interface reserved for itself. To work around this problem, a character device driver has been made, which exposes a `/dev/dmj-<id>` device which can also be used by `dmctl` using `--conn /dev/dmj-<id>`.
+
 ### General subcommands
 
 #### get-device-info