diff --git a/bedstead-faces.css b/bedstead-faces.css
index 00097f3..88d0c3b 100644
--- a/bedstead-faces.css
+++ b/bedstead-faces.css
@@ -1,6 +1,8 @@
 /*
  * This file defines @font-face rules to make the various standard
  * Bedstead fonts available in CSS.
+ *
+ * SPDX-License-Identifier: CC0-1.0
  */
 
 @font-face {
diff --git a/bedstead.css b/bedstead.css
index 8e9227e..23020b6 100644
--- a/bedstead.css
+++ b/bedstead.css
@@ -1,4 +1,8 @@
-/* This is the stylesheet for the Bedstead Web pages. */
+/*
+ * This is the stylesheet for the Bedstead Web pages.
+ *
+ * SPDX-License-Identifier: CC0-1.0
+ */
 
 /* Make Bedstead usable through font-* properties. */
 @import url(bedstead-faces.css);