Updated FAQ (markdown)

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@@ -56,7 +56,26 @@ Windows only. Linux, OSX and other OS's doesn't require this. It looks like Wind
 You will need this after editing `CONSOLE_ENABLE`, `NKRO_ENABLE`, `EXTRAKEY_ENABLE` or `MOUSEKEY_ENABLE` option in **Makefile**.\r
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+## USB VID and PID\r
+You can use any ID you want with editing `config.h`.\r
+Using any presumably unused ID will be no problem in fact except for very least chance of collision with other product. So I don't think it is worth bugging them to get prototype VID.\r
 \r
+For example TMK uses following numbers.\r
+```\r
+keyboard:\r
+hhkb: FEED:CAFE\r
+gh60: FEED:6060\r
+\r
+converter:\r
+x68k: FEED:6800\r
+ps2: FEED:6512\r
+adb: FEED:0ADB\r
+ibm4704: FEED:4704\r
+pc98: FEED:9898\r
+```\r
+\r
+Also see this.\r
+https://github.com/tmk/tmk_keyboard/issues/150\r
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