+To define your own keymap copy `unimap_plain.c` to `unimap_<name>.c` and edit it. Or just edit `unimap_plain.c` directly.
+
+See wiki pages and documents.
+
+https://github.com/tmk/tmk_keyboard/wiki
+
+
+PS/2 signal handling implementations
+------------------------------------
+Following three methods are available to implement PS/2 signal handling.
+
+- **Interrupt** Uses pin interrupt to detect falling edge of clock line. **Recommended.** (ps2_interrupt.c)
+- **Busywait** Implementation with portable C code for reference. (ps2_busywait.c)
+- **USART** Uses AVR USART hardware engine to receive PS/2 signal. You must use this fothis for V-USB. (ps2_usart.c)
+
+TMK converter rev1 uses **USART** and rev2 uses **Interrupt** for reference.
+
+You can change method by editing `Makefile` but not needed in most case.