@@ 732,14 732,17 @@ ready to use it.
@cindex installing Guix from binaries
@cindex installer script
-This section describes how to install Guix on an arbitrary system from a
-self-contained tarball providing binaries for Guix and for all its
-dependencies. This is often quicker than installing from source, which
-is described in the next sections. The only requirement is to have
-GNU@tie{}tar and Xz.
+This section describes how to install Guix from a self-contained tarball
+providing binaries for Guix and for all its dependencies. This is often
+quicker than installing from source, which is described in the next
+sections. Binary installation requires a system using a Hurd or Linux
+kernel; the GNU@tie{}tar and Xz commands must also be available.
+
+@quotation Important
+This section only applies to systems without Guix. Following it for
+existing Guix installations will overwrite important system files.
@c Note duplicated from the ``Installation'' node.
-@quotation Note
We recommend the use of this
@uref{https://git.savannah.gnu.org/cgit/guix.git/plain/etc/guix-install.sh,
shell installer script}. The script automates the download, installation, and