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diff --git a/doc/guix.texi b/doc/guix.texi
index 11664f46f2..65f00ce0b1 100644
--- a/doc/guix.texi
+++ b/doc/guix.texi
@@ -9211,17 +9211,23 @@ running GuixSD.}.
This effects all the configuration specified in @var{file}: user
accounts, system services, global package list, setuid programs, etc.
+The command starts system services specified in @var{file} that are not
+currently running; if a service is currently running, it does not
+attempt to upgrade it since it would not be possible without stopping it
+first.
It also adds a GRUB menu entry for the new OS configuration, and moves
entries for older configurations to a submenu---unless
@option{--no-grub} is passed.
+@quotation Note
@c The paragraph below refers to the problem discussed at
@c <http://lists.gnu.org/archive/html/guix-devel/2014-08/msg00057.html>.
It is highly recommended to run @command{guix pull} once before you run
@command{guix system reconfigure} for the first time (@pxref{Invoking
guix pull}). Failing to do that you would see an older version of Guix
once @command{reconfigure} has completed.
+@end quotation
@item build
Build the operating system's derivation, which includes all the