diff --git a/doc/atari.sgml b/doc/atari.sgml
index 9f7a3fbc4..908763a3f 100644
--- a/doc/atari.sgml
+++ b/doc/atari.sgml
@@ -221,6 +221,16 @@ that the cartridge doesn't prevent the booting of DOS.
 The option byte will be located at address $BFFD. For more information
 about its use, see e.g. "Mapping the Atari".
 
+<sect2><tt/atari-cassette.cfg/<p>
+
+This config file can be used to create cassette boot files. It's suited both
+for C and assembly language programs.
+
+The size of a cassette boot file is restricted to 32K. Larger programs
+would need to be split in more parts and the parts to be loaded manually.
+
+To write the generated file to a cassette, an utility program to run
+on an Atari is provided (<tt/util&sol;atari&sol;w2cas.c/).
 
 <sect1><tt/atarixl/ config files<p>