Updated FAQ (markdown)

FAQ.md

@@ -75,6 +75,17 @@ https://github.com/tmk/tmk_keyboard/blob/master/doc/keymap.md#31-momentary-switc
 http://geekhack.org/index.php?topic=57008.msg1492604#msg1492604
 
 
+## Mechanical Lock Switch Support
+LOCKING_SUPPORT is for mechanical lock switch like this Alps one. http://deskthority.net/wiki/Alps_SKCL_Lock
+
+Using enabling LOCKING_SUPPORT and using LCAP keycode in keymap you can use physical locking Capslock key as you expected. For example, Apple Extended Keyboard(AEK) and AEK II have.
+
+Old vintage mechanical keyboard occasionally has lock switch but modern ones including your HHKB don't have. You don't need LOCKING_SUPPORT for HHKB and just use CAPS for Capslock.
+
+With default HHKB keymap you can register Capslock with FN0+Tab. This doesn't work for you?
+
+
+
 # Degug Console
 ## hid_listen can't recognize device
 When debug console of your device is not ready you will see like this: