diff --git a/Makefile b/Makefile
index 21732e5..991c93a 100644
--- a/Makefile
+++ b/Makefile
@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: BSD-3-Clause
 PREFIX=/usr
 EPREFIX=
 BINDIR=$(PREFIX)/bin
diff --git a/README.md b/README.md
index e55f272..6d368d9 100644
--- a/README.md
+++ b/README.md
@@ -2,6 +2,7 @@
 
 (C) Martin Väth <martin@mvath.de>
 This project is under the BSD license 2.0 (“3-clause BSD license”).
+SPDX-License-Identifier: BSD-3-Clause
 
 A POSIX shell function to treat a variable like an array, quoting args.
 
diff --git a/bin/push.sh b/bin/push.sh
index 70d758d..4146ef3 100755
--- a/bin/push.sh
+++ b/bin/push.sh
@@ -1,5 +1,6 @@
 #!/usr/bin/env cat
 # (C) Martin V\"ath <martin@mvath.de>
+# SPDX-License-Identifier: BSD-3-Clause
 
 Push() {
 	case $1 in