diff --git a/libisoburn/trunk/xorriso/xorriso_eng.html b/libisoburn/trunk/xorriso/xorriso_eng.html
index 7f45a80e..85f303b1 100644
--- a/libisoburn/trunk/xorriso/xorriso_eng.html
+++ b/libisoburn/trunk/xorriso/xorriso_eng.html
@@ -85,6 +85,8 @@ but rather not with CD, DVD-R, DVD+R, BD-R.
allow zisofs, gzip compression, and Jigdo file production.
libbz2 and libbz2-devel
allow bzip2 compression of Jigdo template files.
+Tcl, Tk >= 8.4, Tcl/Tk package BWidget
+enable the operation of GUI frontend script xorriso-tcltk.
@@ -157,6 +159,45 @@ Provides navigation commands for interactive ISO image manipulation.
+
+
GUI Frontend:
+xorriso itself is entirely controlled by text commands. In dialog mode,
+xorriso reads them as text lines from standard input.
+Together with some helpful xorriso commands, it is quite easy for frontend
+programs to operate a separate xorriso process.
+
+Other than the usual batch programs, xorriso will take care of maintaining
+the emerging ISO image model. Its state can be inquired by the frontend
+at any time. The frontend is supposed to care for the display of the inquired
+xorriso state and to send xorriso commands to manipulate the ISO image model.
+
+As a proof of concept, there is a Tcl/Tk script which can
+be launched by shell command xorriso-tcltk
+
+Click on this image to see a screenshot:
+
+
+
+
+See also file
+
+frontend/README-tcltk.
+
+
+The script xorriso-tcltk
+is part of the tarball and gets installed by make install. If a
+xorriso distro package does not install it, you may get it directly from
+
+libburnia SVN: frontend/xorriso-tcltk
+
+You will probably have to give it x-permission after download. Some browsers
+insist in adding ".htm" to the file name.
+
+Further you need xorriso >= 1.2.6, Tcl, Tk >= 8.4,
+Tcl/Tk package "BWidget".
+
+
Command Examples:
