docs: Document how to revert the manifold feature.

diff --git a/docs/grml-live.txt b/docs/grml-live.txt
index 25752b8..3d94ea1 100644 (file)
--- a/docs/grml-live.txt
+++ b/docs/grml-live.txt
@@ -1031,6 +1031,21 @@ Configure approx:
 Don't forget to restart approx (/etc/init.d/approx restart). That's it.
 All downloaded files will be cached in /var/cache/approx now.
 
+[[revert_manifold]]
+How do I revert the manifold feature from an ISO?
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+The so called manifold feature Grml ISOs use by default allows to use the same
+ISO for CD boot and USB boot. If you notice any problems when booting just
+revert the manifold feature running:
+
+  % dd if=/dev/zero of=grml.iso bs=512 count=1 conv=notrunc
+
+To switch from manifold to isohybrid mode (an alternative approach provided by
+syslinux) then just execute:
+
+  % isohybrid grml.iso
+
 [[question]]
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 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~