diff --git a/module/zcommon/zfs_fletcher_aarch64_neon.c b/module/zcommon/zfs_fletcher_aarch64_neon.c
index 26f2115c4..b6ec3da61 100644
--- a/module/zcommon/zfs_fletcher_aarch64_neon.c
+++ b/module/zcommon/zfs_fletcher_aarch64_neon.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: BSD-2-Clause OR GPL-2.0-only
 /*
  * Implement fast Fletcher4 with NEON instructions. (aarch64)
  *
diff --git a/module/zcommon/zfs_fletcher_intel.c b/module/zcommon/zfs_fletcher_intel.c
index 34590a155..570076ba2 100644
--- a/module/zcommon/zfs_fletcher_intel.c
+++ b/module/zcommon/zfs_fletcher_intel.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: BSD-2-Clause OR GPL-2.0-only
 /*
  * Implement fast Fletcher4 with AVX2 instructions. (x86_64)
  *
diff --git a/module/zcommon/zfs_fletcher_sse.c b/module/zcommon/zfs_fletcher_sse.c
index 8ab9b9acb..96aaf1622 100644
--- a/module/zcommon/zfs_fletcher_sse.c
+++ b/module/zcommon/zfs_fletcher_sse.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: BSD-2-Clause OR GPL-2.0-only
 /*
  * Implement fast Fletcher4 with SSE2,SSSE3 instructions. (x86)
  *
diff --git a/module/zcommon/zfs_fletcher_superscalar.c b/module/zcommon/zfs_fletcher_superscalar.c
index 2a80816ff..e0faa995e 100644
--- a/module/zcommon/zfs_fletcher_superscalar.c
+++ b/module/zcommon/zfs_fletcher_superscalar.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: BSD-2-Clause OR GPL-2.0-only
 /*
  * Implement fast Fletcher4 using superscalar pipelines.
  *
diff --git a/module/zcommon/zfs_fletcher_superscalar4.c b/module/zcommon/zfs_fletcher_superscalar4.c
index 0b52bb63d..1cec1851e 100644
--- a/module/zcommon/zfs_fletcher_superscalar4.c
+++ b/module/zcommon/zfs_fletcher_superscalar4.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: BSD-2-Clause OR GPL-2.0-only
 /*
  * Implement fast Fletcher4 using superscalar pipelines.
  *