diff --git a/.dir-locals.el b/.dir-locals.el
index e0716f9..f8ee130 100644
--- a/.dir-locals.el
+++ b/.dir-locals.el
@@ -1,3 +1,4 @@
+;;; SPDX-License-Identifier: GPL-3.0-or-later
 ;; Per-directory local variables for GNU Emacs 23 and later.
 
 ((nil
diff --git a/.guix-authorizations b/.guix-authorizations
index 39e9bdd..2103b65 100644
--- a/.guix-authorizations
+++ b/.guix-authorizations
@@ -1,3 +1,4 @@
+;;; SPDX-License-Identifier: GPL-3.0-or-later
 ;; This is the list of OpenPGP keys currently authorized to sign commits in
 ;; this repository.
 
diff --git a/.guix-channel b/.guix-channel
index 73787dc..cfa33b0 100644
--- a/.guix-channel
+++ b/.guix-channel
@@ -1,3 +1,4 @@
+;;; SPDX-License-Identifier: GPL-3.0-or-later
 ;; -*- mode: scheme; -*-
 
 (channel