doc: Mention 'swapon'.

Suggested by David Braun <Guix-box@snkmail.com>
at <https://lists.gnu.org/archive/html/guix-devel/2016-12/msg00744.html>.

* doc/guix.texi (Preparing for Installation): Add 'swapon'.

diff --git a/doc/guix.texi b/doc/guix.texi
index 99bde4a..e3c4524 100644 (file)
--- a/doc/guix.texi
+++ b/doc/guix.texi
@@ -6868,6 +6868,7 @@ swap partition on @file{/dev/sda2}, you would run:
 
 @example
 mkswap /dev/sda2
+swapon /dev/sda2
 @end example
 
 @node Proceeding with the Installation