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diff --git a/finddup.1 b/finddup.1
index d0c0eba..b6d758e 100644
--- a/finddup.1
+++ b/finddup.1
@@ -1,9 +1,9 @@
+.TH "FINDDUP" 1 "Mar 2010" "Francois Fleuret" "User Commands"
+
 \" This man page was written by Francois Fleuret <francois@fleuret.org>
 \" and is distributed under a Creative Commons Attribution-Share Alike
 \" 3.0 License.
 
-.TH "FINDDUP" 1 "Mar 2010" "Francois Fleuret" "User Commands"
-
 .SH "NAME"
 
 finddup \- Find files common to two directories (or not)
@@ -14,9 +14,9 @@ finddup \- Find files common to two directories (or not)
 
 .SH "DESCRIPTION"
 
-With a single directory argument, \fBfinddup\fP prints the duplicate
+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
+common to both DIR1 and DIR2, or with the `not:' prefix, the ones
 present in DIR1 and not in DIR2.
 
 .SH "OPTIONS"
@@ -24,13 +24,49 @@ present in DIR1 and not in DIR2.
 \fB-h\fR
 display help and exit
 .TP
+\fB-d\fR
+ignore files and directories starting with a dot
+.TP
+\fB-c\fR
+do not show which files from DIR2 corresponds to files from DIR1
+.TP
+\fB-g\fR
+show the file group IDs (one group for each content)
+.TP
 \fB-r\fR
 shows the real path of the files
 
 .SH "BUGS"
 
-Every pair of different files with same content are listed, which
-results in K^2 printed lines when K files are similar.
+The display is not sorted by groups.
+
+.SH "EXAMPLES"
+.nf
+.B finddup -c blah something
+
+.fi
+List files found in
+.B ./blah/
+which have a matching file with exact same content in
+.B ./something/
+
+.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 -g ./tralala ./cuicui | sort -n
+
+.fi
+List groups of files with same content which exist both in
+.B ./tralala/
+and
+.B ./cuicui/
 
 .SH "AUTHOR"