civodul pushed a commit to branch master
in repository guix.

commit 0767f6a69e96185a9a8c6377ac946037b966d4c7
Author: Ludovic Courtès <[email protected]>
Date:   Thu Feb 25 19:29:21 2016 +0100

    doc: Clarify the form of UUIDs we expect.
    
    Fixes <http://bugs.gnu.org/22797>.
    Reported by Alex Kost <[email protected]>.
    
    * doc/guix.texi (File Systems): Clarify which UUIDs we're talking
    about.
---
 doc/guix.texi |    7 ++++++-
 1 files changed, 6 insertions(+), 1 deletions(-)

diff --git a/doc/guix.texi b/doc/guix.texi
index 2bebeed..004e50c 100644
--- a/doc/guix.texi
+++ b/doc/guix.texi
@@ -6302,7 +6302,12 @@ is interpreted as a partition label name; when it is 
@code{uuid},
 @code{device} is interpreted as a partition unique identifier (UUID).
 
 UUIDs may be converted from their string representation (as shown by the
-@command{tune2fs -l} command) using the @code{uuid} form, like this:
+@command{tune2fs -l} command) using the @code{uuid} form@footnote{The
+@code{uuid} form expects 16-byte UUIDs as defined in
+@uref{https://tools.ietf.org/html/rfc4122, RFC@tie{}4122}.  This is the
+form of UUID used by the ext2 family of file systems and others, but it
+is different from ``UUIDs'' found in FAT file systems, for instance.},
+like this:
 
 @example
 (file-system

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