Add mention of the usbkbd/ dir in the README.

1 files changed, 4 insertions, 0 deletions

diff --git a/README.md b/README.md
index 9bb3c4d..82fec48 100644
--- a/README.md
+++ b/README.md
@@ -9,11 +9,14 @@ The [original Inkplate 6 case]'s top is used (since the Inkplate came glued to i
 The Inkplate provides power via a lithium battery, and access to its display, its microSD card, and its Wi-Fi and Bluetooth connectivity.
 The iCEBreaker is connected to the Inkplate over both I²C and UART.
 The iCEBreaker is augmented with a [quad HyperRAM PMOD] module, which it uses for main memory.
+A [CH559] is used to provide support for USB keyboards.
+It connects to the iCEBreaker over UART, essentially acting as a PS/2 keyboard would.
 
 [iCEBreaker]: https://docs.icebreaker-fpga.org/
 [Inkplate 6]: https://soldered.com/product/soldered-inkplate-6-6-e-paper-board/
 [original Inkplate 6 case]: https://github.com/SolderedElectronics/Inkplate-6-hardware/blob/master/3D%20printable%20case/Original%20case
 [quad HyperRAM PMOD]: https://1bitsquared.com/products/pmod-hyperram
+[CH559]: https://www.wch-ic.com/products/CH559.html
 
 The different components are in the following subdirectories:
 
@@ -21,6 +24,7 @@ The different components are in the following subdirectories:
 - `fpga/` contains the [Bluespec] code that runs on the iCEBreaker.
 - `inkplate/` contains the code that runs on the Inkplate.
 - `simhost/` contains Rust code that implements simulated peripherals for bluesim.
+- `usbkbd/` contains the C code that runs on the CH559.
 
 [Bluespec]: https://github.com/B-Lang-org/bsc
 [OpenSCAD]: https://openscad.org/