Updated FAQ (markdown)

diff --git a/FAQ.md b/FAQ.md
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@@ -67,6 +67,14 @@ http://geekhack.org/index.php?topic=14290.msg1327264#msg1327264
 Solves my personal 'the' problem. I often got 'the' or 'THe' wrongly instead of 'The'.  Oneshot Shift mitgates this for me.\r
 https://github.com/tmk/tmk_keyboard/issues/67\r
 \r
+## Modifier/Layer stuck\r
+Modifier keys or layers can be stuck unless layer switching is configured properly.\r
+For Modifier keys and layer actions you have to place `KC_TRANS` on same position of destination layer to  unregister the modifier key or return to previous layer on release event.\r
+\r
+https://github.com/tmk/tmk_keyboard/blob/master/doc/keymap.md#31-momentary-switching\r
+http://geekhack.org/index.php?topic=57008.msg1492604#msg1492604\r
+\r
+\r
 # Degug Console\r
 ## hid_listen can't find device\r
 When debug console of your device is not ready you will see like this:\r