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-rw-r--r--microkernel/mach/gnumach/building.mdwn15
1 files changed, 11 insertions, 4 deletions
diff --git a/microkernel/mach/gnumach/building.mdwn b/microkernel/mach/gnumach/building.mdwn
index ecaae7f8..24a73608 100644
--- a/microkernel/mach/gnumach/building.mdwn
+++ b/microkernel/mach/gnumach/building.mdwn
@@ -95,7 +95,14 @@ Optionally run the (tiny) test suite:
$ make check
-The resulting kernel binary can now be moved into place (just copy
-`gnumach.gz`, typically to `/boot/gnumach.gz`), so you can boot your system
-with the new kernel. It is a good idea to make a backup of the previously
-installed binary, in case you need to recover.
+It's a good idea to make a backup of the previously installed kernel, in case
+you can't boot using the new one. That way, you can restore it after booting
+from a rescue media (or mounting the disk image used by your vm).
+
+ # cp /boot/gnumach.gz /boot/gnumach.gz.bak
+
+GNU Mach can now be moved into place, typically `/boot/gnumach.gz`, so that you
+can boot your system with the new kernel.
+
+ # cp gnumach.gz /boot
+