diff --git a/src/arch/x86_64/asm.rs b/src/arch/x86_64/asm.rs
index e06e3a01..0ed57930 100644
--- a/src/arch/x86_64/asm.rs
+++ b/src/arch/x86_64/asm.rs
@@ -1,3 +1,6 @@
+// SPDX-License-Identifier: Apache-2.0
+// Copyright 2020 Google LLC
+
 use core::arch::global_asm;
 
 global_asm!(include_str!("ram32.s"), options(att_syntax, raw));
diff --git a/src/arch/x86_64/gdt.rs b/src/arch/x86_64/gdt.rs
index 82119954..4846ca02 100644
--- a/src/arch/x86_64/gdt.rs
+++ b/src/arch/x86_64/gdt.rs
@@ -1,3 +1,6 @@
+// SPDX-License-Identifier: Apache-2.0
+// Copyright 2020 Google LLC
+
 use core::mem::size_of;
 
 bitflags::bitflags! {
diff --git a/src/arch/x86_64/paging.rs b/src/arch/x86_64/paging.rs
index d185dfd4..d4789741 100644
--- a/src/arch/x86_64/paging.rs
+++ b/src/arch/x86_64/paging.rs
@@ -1,3 +1,6 @@
+// SPDX-License-Identifier: Apache-2.0
+// Copyright 2020 Google LLC
+
 use x86_64::{
     registers::control::Cr3,
     structures::paging::{PageSize, PageTable, PageTableFlags, PhysFrame, Size2MiB},
diff --git a/src/arch/x86_64/ram32.s b/src/arch/x86_64/ram32.s
index c3ea8d67..fa69d094 100644
--- a/src/arch/x86_64/ram32.s
+++ b/src/arch/x86_64/ram32.s
@@ -1,3 +1,6 @@
+# SPDX-License-Identifier: Apache-2.0
+# Copyright 2020 Google LLC
+
 .section .text32, "ax"
 .global ram32_start
 .code32
diff --git a/src/arch/x86_64/sse.rs b/src/arch/x86_64/sse.rs
index a2d5f12c..5e38d68a 100644
--- a/src/arch/x86_64/sse.rs
+++ b/src/arch/x86_64/sse.rs
@@ -1,3 +1,6 @@
+// SPDX-License-Identifier: Apache-2.0
+// Copyright 2020 Google LLC
+
 use x86_64::registers::control::{Cr0, Cr0Flags, Cr4, Cr4Flags};
 
 // Enable SSE2 for XMM registers (needed for EFI calling)
diff --git a/src/pvh.rs b/src/pvh.rs
index 5cd4fa65..ed7c8ad8 100644
--- a/src/pvh.rs
+++ b/src/pvh.rs
@@ -1,3 +1,6 @@
+// SPDX-License-Identifier: Apache-2.0
+// Copyright 2020 Google LLC
+
 use core::mem::size_of;
 
 use crate::{