04/11: doc: Clarify 'cow-store'.

[Ludovic Courtès]

civodul pushed a commit to branch master
in repository guix.

commit b397c0d58af641911deb8fd28c2543b68b5275b7
Author: Ludovic Courtès <address@hidden>
Date:   Mon Mar 28 21:47:12 2016 +0200

    doc: Clarify 'cow-store'.
    
    Suggested by Chris Marusich <address@hidden>.
    
    * doc/guix.texi (Proceeding with the Installation): Clarify what
    'cow-store' is about.
---
 doc/guix.texi |    8 +++++---
 1 files changed, 5 insertions(+), 3 deletions(-)

diff --git a/doc/guix.texi b/doc/guix.texi
index 62ca82b..71ba4fa 100644
--- a/doc/guix.texi
+++ b/doc/guix.texi
@@ -6033,9 +6033,11 @@ With the target partitions ready and the target root 
mounted on
 herd start cow-store /mnt
 @end example
 
-This makes @file{/gnu/store} copy-on-write, such that packages added to
-it during the installation phase are written to the target disk rather
-than kept in memory.
+This makes @file{/gnu/store} copy-on-write, such that packages added to it
+during the installation phase are written to the target disk on @file{/mnt}
+rather than kept in memory.  This is necessary because the first phase of
+the @command{guix system init} command (see below) entails downloads or
+builds to @file{/gnu/store} which, initially, is an in-memory file system.
 
 Next, you have to edit a file and
 provide the declaration of the operating system to be installed.  To