+@example
+ \bookpaper@{
+ hsize = 2\cm
+ topmargin = 3\cm
+ bottommargin = 3\cm
+ raggedlastbottom = ##t
+ @}
+@end example
+
+You can also define these values in scheme. Please note that the scheme
+expressions may have a dash, like @code{foot-sep}, but not LilyPond
+expressions, like @code{footsep}.
+
+@example
+ \bookpaper@{
+ #(define bottom-margin (* 2 cm))
+ @}
+@end example
+
+@c is this explanations really necessary?
+In that case @code{mm}, @code{in}, @code{pt} and @code{cm} are variables
+defined in @file{book-paper-defaults.ly} with values in
+millimeters. That's why the value has to be multiplied in the example
+above.
+