-Every pair of different files with same content are listed, which
-results in K^2 printed lines when K files are similar.
+None known, probably many. Valgrind does not complain though.
+
+While not a bug per se, the for of the output should definitely be
+improved. Not clear how.
+
+.SH "EXAMPLES"
+.nf
+.B finddup -cg blah something
+
+.fi
+List files found in
+.B ./blah/
+which have a matching file with exact same content in
+.B ./something/
+without the group IDs
+
+.P
+.B finddup ./sources not:./backup
+
+.fi
+List all files found in
+.B ./sources/
+which do not have content-matching equivalent in
+.B ./backup.sources
+
+.P
+.B finddup ./tralala ./cuicui | sort -n
+
+.fi
+List groups of files with same content which exist both in
+.B ./tralala/
+and
+.B ./cuicui/