--- a/xorg.rst	Thu Jun 25 17:09:24 2009 +0300
+++ b/xorg.rst	Mon Jul 13 08:50:32 2009 +0300
@@ -22,3 +22,25 @@
   EndSection
 
 Time measure in minute.
+
+* Set display dimensions.
+
+To see currect settings type:
+
+  $ xdpyinfo | grep   dimensions:
+dimensions:    1280x1024 pixels (382x302 millimeters)
+
+From this dimensions calculated your display dpi resolution:
+
+  $ xdpyinfo | grep resolution:
+resolution:    85x86 dots per inch
+
+To set dimensions edit '/etc/X11/xorg.conf' (size in mm):
+
+  $ cat /etc/X11/xorg.conf
+...
+Section "Monitor"
+...
+  DisplaySize     width height
+...
+EndSection