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diff --git a/gnu/installer/substitutes.scm b/gnu/installer/substitutes.scm
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+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2020 Mathieu Othacehe <m.othacehe@gmail.com>
+;;;
+;;; This file is part of GNU Guix.
+;;;
+;;; GNU Guix is free software; you can redistribute it and/or modify it
+;;; under the terms of the GNU General Public License as published by
+;;; the Free Software Foundation; either version 3 of the License, or (at
+;;; your option) any later version.
+;;;
+;;; GNU Guix is distributed in the hope that it will be useful, but
+;;; WITHOUT ANY WARRANTY; without even the implied warranty of
+;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+;;; GNU General Public License for more details.
+;;;
+;;; You should have received a copy of the GNU General Public License
+;;; along with GNU Guix.  If not, see <http://www.gnu.org/licenses/>.
+
+(define-module (gnu installer substitutes)
+  #:use-module (gnu installer utils)
+  #:use-module (gnu services herd)
+  #:export (enable-discovery
+            disable-discovery))
+
+(define (enable-discovery)
+  (with-silent-shepherd
+    (with-shepherd-action 'guix-daemon
+        ('discover "on")
+        result
+      result)))
+
+(define (disable-discovery)
+  (with-silent-shepherd
+    (with-shepherd-action 'guix-daemon
+        ('discover "off")
+        result
+      result)))
+
+;; Local Variables:
+;; eval: (put 'with-silent-shepherd 'scheme-indent-function 0)
+;; End: