diff --git a/build/patch/buildpatch.ksh b/build/patch/buildpatch.ksh
index 27a19a14097..97c140166b9 100644
--- a/build/patch/buildpatch.ksh
+++ b/build/patch/buildpatch.ksh
@@ -1,14 +1,22 @@
-/bin/ksh
-#
+#/bin/ksh
+#----------------------------------------------------------------------------
+# \file         build/patch/buildpatch.ksh
+# \brief        Create patch files
+# \version      $Revision$
+# \author       (c)2009 Laurent Destailleur  <eldy@users.sourceforge.net>
+#----------------------------------------------------------------------------
 # This script can be used to build a patch after a developer has made
 # changes on files in its Dolibarr tree.
 # The output patch file can then be submited on Dolibarr dev mailing-list,
 # with explanation on its goal, for inclusion in main branch.
-#
+#----------------------------------------------------------------------------
 
-export oldir=original_dir
+# Put here full path of original and new dolibarr directories
+# Example: olddir=/mydirA1/mydirA2/dolibarrold
+# Example: newdir=/mydirB1/mydirB2/dolibarr
+export olddir=original_dir
 export newdir=modified_dir
 
-echo Building patch file mypatch.patch
+echo ----- Building patch file mypatch.patch -----
 diff -Naur --exclude=CVS --exclude="*.patch" --exclude=".#*" --exclude="*~" --exclude="*.rej" --exclude="*.orig" --exclude="*.bak" --exclude=conf.php --exclude=documents  $olddir  $newdir  > mypatch.patch