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-rw-r--r--docs/system/usb.rst3
1 files changed, 3 insertions, 0 deletions
diff --git a/docs/system/usb.rst b/docs/system/usb.rst
index ddfa828d74..9a2f1927c4 100644
--- a/docs/system/usb.rst
+++ b/docs/system/usb.rst
@@ -81,6 +81,9 @@ option or the ``device_add`` monitor command. Available devices are:
 ``usb-audio``
    USB audio device
 
+``u2f-{emulated,passthru}``
+   Universal Second Factor device
+
 .. _host_005fusb_005fdevices:
 
 Using host USB devices on a Linux host