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diff --git a/finddup.1 b/finddup.1
index 36ae5a3..54034b6 100644
--- a/finddup.1
+++ b/finddup.1
@@ -1,34 +1,45 @@
+.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 several directories or not
+finddup \- Find files common to two directories (or not)
 
 .SH "SYNOPSIS"
 
-\fBfinddup\fP [OPTION]... [FILE]...
+\fBfinddup\fP [OPTION]... DIR1 [[not:]DIR2]
 
 .SH "DESCRIPTION"
 
-\fBfinddup\fP is a command line utility to find duplicate files, files
-common to two directories or files existing in one directories and not
-in another one.
+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.
 
 .SH "OPTIONS"
 .TP
 \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"
 
-None known, probably many though.
+Every pair of different files with same content are listed, which
+results in K^2 printed lines when K files are similar.
 
 .SH "AUTHOR"