@@ 2675,7 2675,9 @@ The @command{guix download} command supports the same URIs as used in
package definitions. In particular, it supports @code{mirror://} URIs.
@code{https} URIs (HTTP over TLS) are supported @emph{provided} the
Guile bindings for GnuTLS are available in the user's environment; when
-they are not available, an error is raised.
+they are not available, an error is raised. @xref{Guile Preparations,
+how to install the GnuTLS bindings for Guile,, gnutls-guile,
+GnuTLS-Guile}, for more information.
The following option is available: