=head1 DESCRIPTION
-dh_prep is a debhelper program that performs some file cleanups in
-preparation for building a package. (This is what dh_clean -k used to do.)
-It removes the package build directories, debian/tmp, and some temp files
-that are generated during the build. Putting this at the start of the build
-process makes the build process idempotent.
+B<dh_prep> is a debhelper program that performs some file cleanups in
+preparation for building a binary package. (This is what B<dh_clean -k>
+used to do.) It removes the package build directories, F<debian/tmp>,
+and some temp files that are generated when building a binary package.
+
+It is typically run at the top of the B<binary-arch> and B<binary-indep> targets,
+or at the top of a target such as install that they depend on.
=head1 OPTIONS
=item B<-X>I<item> B<--exclude=>I<item>
-Exclude files that contain "item" anywhere in their filename from being
+Exclude files that contain F<item> anywhere in their filename from being
deleted, even if they would normally be deleted. You may use this option
multiple times to build up a list of things to exclude.