Updated FAQ (markdown)

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@@ -9,9 +9,11 @@ It is no longer recommended and may cause some problem.
 See [Issue #99](https://github.com/tmk/tmk_keyboard/issues/99).
 
 ## USB stack: LUFA or PJRC?
-Use **LUFA**. **PJRC** stack won't be supported actively anymore. There is no reason to hesitate to use LUFA except for binary size(about 1KB lager?).
+Use **LUFA**.
 
-See also [Issue #50](https://github.com/tmk/tmk_keyboard/issues/50) and [Issue #58](https://github.com/tmk/tmk_keyboard/issues/58).
+**PJRC** stack won't be supported actively anymore. There is no reason to hesitate to use LUFA except for binary size(about 1KB lager?). See also [Issue #50](https://github.com/tmk/tmk_keyboard/issues/50) and [Issue #58](https://github.com/tmk/tmk_keyboard/issues/58).
+
+But **PJRC** is still very useful for debug and development purpose.
 
 # Degug Console
 ## hid_listen can't find device