Clarified man page about excluding files

git-svn-id: http://svn.savannah.nongnu.org/svn/rdiff-backup@439 2b77aa54-bcbc-44c9-a7ec-4f6cf2b41109

branches/r0-12/rdiff-backup/rdiff-backup.1

@@ -519,12 +519,12 @@ string specified by --remote-schema, quote it with another %, as in
 .B rdiff-backup
 supports file selection options similar to (but different from)
 .BR rsync (1).
-The system may appear complicated, but it is supposed to be flexible
-and easy-to-use.
-
 When rdiff-backup is run, it searches through the given source
 directory and backs up all the files specified by the file selection
-system.  The file selection system comprises a number of file
+system.  The system may appear complicated, but it is supposed to be
+flexible and easy-to-use.
+
+The file selection system comprises a number of file
 selection conditions, which are set using one of the following command
 line options:
 .BR --exclude , --exclude-device-files , --exclude-filelist ,
@@ -538,7 +538,9 @@ and
 Each file selection condition either matches or doesn't match a given
 file.  A given file is excluded by the file selection system exactly
 when the first matching file selection condition specifies that the
-file be excluded; otherwise the file is included.
+file be excluded; otherwise the file is included.  If a file is
+excluded, rdiff-backup acts as if that file does not exist in the
+source directory.
 
 For instance,
 .PP