doc: Mention that trusted channels must have an introduction.

* doc/guix.texi (Invoking guix pull): Mention that “trusted channels” must
have an introduction; explain how channels are identified.

Reported-by: Simon Tournier <zimon.toutoune@gmail.com>
Change-Id: Ie89702cc17bc90130153a56df1f0844b19cfff23
Signed-off-by: Ludovic Courtès <ludo@gnu.org>
Merges: #8565

1 files changed, 4 insertions, 1 deletions

diff --git a/doc/guix.texi b/doc/guix.texi
index 4ba4b650de7..67c81ebe836 100644
--- a/doc/guix.texi
+++ b/doc/guix.texi
@@ -4861,7 +4861,10 @@ among the user's @dfn{trusted channels}, defined as:
 @itemize
 @item
 the channels returned by @file{~/.config/guix/trusted-channels.scm},
-which has the same format as any channel file;
+which has the same format as any channel file (these channels
+@emph{must} have an ``introduction'', @pxref{Channel Authentication};
+channels are identified by their introduction and other fields are
+ignored, including @code{url} and @code{name});
 
 @item
 or, if the above file doesn't exist, the currently-used channels as