diff --git a/.github/workflows/freebsd.yml b/.github/workflows/freebsd.yml
index 669de3a8..69643cf2 100644
--- a/.github/workflows/freebsd.yml
+++ b/.github/workflows/freebsd.yml
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: 0BSD
+
 name: FreeBSD
 
 on:
diff --git a/.github/workflows/netbsd.yml b/.github/workflows/netbsd.yml
index 2421f53a..44ef2699 100644
--- a/.github/workflows/netbsd.yml
+++ b/.github/workflows/netbsd.yml
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: 0BSD
+
 name: NetBSD
 
 on:
diff --git a/.github/workflows/openbsd.yml b/.github/workflows/openbsd.yml
index 25ebbc56..d02f8ab0 100644
--- a/.github/workflows/openbsd.yml
+++ b/.github/workflows/openbsd.yml
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: 0BSD
+
 name: OpenBSD
 
 on: