Minor documentation improvements.

LUFA/DoxygenPages/CompilingApps.txt

@@ -23,6 +23,10 @@
  *  of the MinGW installer (<a>http://www.mingw.org</a>). Once installed, add the "msys\1.0\bin" of the MinGW installation
  *  folder is added to your system's <b>PATH</b> environment variable.
  *
+ *  The bootloaders currently also require the "bc" application, which can be installed from
+ *  <a>http://gnuwin32.sourceforge.net/downlinks/bc.php</a>. Once installed add the "GnuWin32\bin" path of the GnuWin32
+ *  installation folder to your system's <b>PATH</b> environment variable.
+ *
  *  \subsection SSec_PreqLinux Linux Prerequisites
  *  On Linux systems you will need to install the latest Linux distribution of the standalone Atmel Toolchain from the
  *  Atmel website for general development, or use the latest avr-libc and avr-gcc packages for your chosen distribution's