-Apple Extended Keyboard and Apple Extended Keyboard II are the examples.
-Though ADB protocol itsef has the ability of distinction between right and left.
-And most ADB keyboard has no NKRO functionality, though ADB protocol itsef has that.
-See protocol/adb.c for more info.
+Apple Extended Keyboard and Apple Extended Keyboard II can discriminate both side
+modifiers except for GUI key(Windows/Command).
+
+And most ADB keyboard has no diodes in its matrix so they are not NKRO,
+though ADB protocol itself supports it. See protocol/adb.c for more info.
+
+If keyobard has ISO layout you need to use ISO keymap with `make KEYMAP=iso`. With ANSI
+keymap you will suffer from swapped keys problem.
+
+https://github.com/tmk/tmk_keyboard/issues/35