diff --git a/vsock/src/main.rs b/vsock/src/main.rs
index 6f35f7f..9e433a1 100644
--- a/vsock/src/main.rs
+++ b/vsock/src/main.rs
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: Apache-2.0 or BSD-3-Clause
+
 mod rxops;
 mod rxqueue;
 mod thread_backend;
diff --git a/vsock/src/rxops.rs b/vsock/src/rxops.rs
index 3460a8d..7212c7f 100644
--- a/vsock/src/rxops.rs
+++ b/vsock/src/rxops.rs
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: Apache-2.0 or BSD-3-Clause
+
 #[derive(Clone, Copy, Eq, PartialEq, Debug)]
 pub enum RxOps {
     /// VSOCK_OP_REQUEST
diff --git a/vsock/src/rxqueue.rs b/vsock/src/rxqueue.rs
index 0a1dbda..10f8572 100644
--- a/vsock/src/rxqueue.rs
+++ b/vsock/src/rxqueue.rs
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: Apache-2.0 or BSD-3-Clause
+
 use super::rxops::RxOps;
 
 #[derive(Debug, Eq, PartialEq)]
diff --git a/vsock/src/thread_backend.rs b/vsock/src/thread_backend.rs
index 50c853f..436cd65 100644
--- a/vsock/src/thread_backend.rs
+++ b/vsock/src/thread_backend.rs
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: Apache-2.0 or BSD-3-Clause
+
 #![deny(missing_docs)]
 
 use super::{
diff --git a/vsock/src/txbuf.rs b/vsock/src/txbuf.rs
index 40c935c..4c435b0 100644
--- a/vsock/src/txbuf.rs
+++ b/vsock/src/txbuf.rs
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: Apache-2.0 or BSD-3-Clause
+
 use super::vhu_vsock::{Error, Result, CONN_TX_BUF_SIZE};
 use std::{io::Write, num::Wrapping};
 use vm_memory::{bitmap::BitmapSlice, VolatileSlice};
diff --git a/vsock/src/vhu_vsock.rs b/vsock/src/vhu_vsock.rs
index b86494b..49e48c6 100644
--- a/vsock/src/vhu_vsock.rs
+++ b/vsock/src/vhu_vsock.rs
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: Apache-2.0 or BSD-3-Clause
+
 use super::vhu_vsock_thread::*;
 use clap::Parser;
 use core::slice;
diff --git a/vsock/src/vhu_vsock_thread.rs b/vsock/src/vhu_vsock_thread.rs
index 0e3c59c..f28e44e 100644
--- a/vsock/src/vhu_vsock_thread.rs
+++ b/vsock/src/vhu_vsock_thread.rs
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: Apache-2.0 or BSD-3-Clause
+
 use super::{
     rxops::*,
     thread_backend::*,
diff --git a/vsock/src/vsock_conn.rs b/vsock/src/vsock_conn.rs
index 96418ba..3d590d5 100644
--- a/vsock/src/vsock_conn.rs
+++ b/vsock/src/vsock_conn.rs
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: Apache-2.0 or BSD-3-Clause
+
 use super::{
     rxops::*,
     rxqueue::*,