update man page

doc/gmsh.1

-.\" $Id: gmsh.1,v 1.55 2004-06-04 18:58:46 geuzaine Exp $
-.TH Gmsh 1 "4 June 2004" "Gmsh 1.53" "Gmsh Manual Pages"
+.\" $Id: gmsh.1,v 1.56 2004-06-30 21:44:46 geuzaine Exp $
+.TH Gmsh 1 "30 June 2004" "Gmsh 1.54" "Gmsh Manual Pages"
 .UC 4
 .\" ********************************************************************
 .SH NAME
@@ -58,6 +58,9 @@ select the two-dimensional mesh algorithm (default: iso).
 .B \-smooth int
 set the number of smoothing steps (default value is 0).
 .TP 4
+.B \-optimize
+optimize quality of tetrahedral elements
+.TP 4
 .B \-order int
 set the order of the generated elements (default value is 1).
 .TP 4