.SH "SYNOPSIS"
-\fBfinddup\fP [OPTION]... DIR1 [[not:]DIR2]
+\fBfinddup\fP [OPTION]... DIR1 [[and:|not:]DIR2]
.SH "DESCRIPTION"
With a single directory argument, \fBfinddup\fP prints the duplicated
files found in it. With two directories, it prints either the files
common to both DIR1 and DIR2, or with the `not:' prefix, the ones
-present in DIR1 and not in DIR2.
+present in DIR1 and not in DIR2. The and: prefix is assumed by default
+and necessary only if you have a directory name starting with `not:'.
-It compares files by first comparing their sizes, hence goes
+This command compares files by first comparing their sizes, hence goes
reasonably fast.
When looking for identical files, \fBfinddup\fP associates by default
-a group ID to every content, and prints it along the file names.
+a group ID to every content, and prints it along the file names. Use
+the \fB-g\fP to switch it off.
Note that
.B finddup DIR