diff --git a/doc/ref/helpintf.xml b/doc/ref/helpintf.xml
index 262b395aebf..635e258a543 100644
--- a/doc/ref/helpintf.xml
+++ b/doc/ref/helpintf.xml
@@ -90,25 +90,20 @@ any more. The book can be re-installed using .
The manual.six File
-If a manual.six file for a help book is not in the format of the
-gapmacro.tex macros, explained in the document
-The gapmacro.tex Manual Format
(see the file
-gap4r5/doc/gapmacrodoc.pdf from the tools archive
-etc/tools.tar.gz which should be unpacked using the script
-etc/install-tools.sh), the first non-empty line of
-manual.six must be of the form
+The first non-empty line of manual.six should be of the form
#SIXFORMAT myownformat
-where myownformat is an identifying string for this format.
-The reading of
-the (remainder of the) file is then delegated to the function
-HELP_BOOK_HANDLER.myownformat.ReadSix which must exist.
-Thus there are
-no further regulations for the format of the manual.six file, other that
-what you yourself impose. If such a line is missing then it is assumed that
-the manual.six file complies with the gapmacro.tex documentation format
-which is the default format.
+where myownformat is an identifying string for this format. The reading
+of the (remainder of the) file is then delegated to the function
+HELP_BOOK_HANDLER.myownformat.ReadSix which must exist. Thus there
+are no further regulations for the format of the manual.six file, other
+that what you yourself impose.
+
+If such a line is missing then it is assumed that the manual.six file
+complies with the gapmacro.tex documentation format which is the
+default format, and reading the file is delegated to
+HELP_BOOK_HANDLER.default.ReadSix.
Section explains how the return value of
HELP_BOOK_HANDLER.myownformat.ReadSix should look like and which further