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M README.md

@@ 29,10 29,35 @@ I got my PCBS made at [JLCPCB][5]. No issues.
 
 [5]: https://jlcpcb.com/
 
+## BOM
+
+ - 4 x PCBs
+ - 68 x Keyswitches (with diode holes - wider than LED holes! I used Zealios)
+ - 68 x Diodes (1N4148)
+ - 2 x ProMicro + header pins 
+ - 2 x TRRS jacks (PJ-320A [aliexpress](https://www.aliexpress.com/item/32825553898.html))
+ - 1 x TRRS cable
+ - 2 x 4k7 Ohm resistors (I2C pullups)
+ - 2 x 5pin headers
+ - 4 x M6 nylon screw thread + nuts (for tenting, optional)
+ - Some sticky-backed neoprene tape (optional, for padding/non-slip on the bottom
+  of the board
+
 ## Build
 
 See [build guide](build_guide/).
 
+## Software
+
+[QMK](https://qmk.fm/). ErgoSnap uses exactly the same matrix as the ErgoDash,
+so just build an ErgoDash layout (using the `LAYOUT_3key_1us` layout type).
+
+For an example see my [`ergodash-isolike` layout](https://github.com/tcrs/qmk_firmware/tree/ergosnap-isolike).
+
+Example make command:
+
+	make ergodash/rev1:isolike:avrdude
+
 ## License
 
 ErgoDash & Ergo42 are MIT, Mitosis is GPLv3. So this work as a whole is GPLv3.