-# \DeclareLaTeXClass{extbook}
-# Book textclass definition file. Taken from initial LyX source code
-# Author : Matthias Ettrich <ettrich@informatik.uni-tuebingen.de>
-# this file: Herbert Voss <voss@lyx.org>
+# \DeclareLaTeXClass[extbook]{Book (Standard Class with Extra Font Sizes)}
+# \DeclareCategory{Books}
+# Extended book textclass definition file.
+# Herbert Voss <voss@lyx.org>