diff --git a/scripts/ectool.sh b/scripts/ectool.sh
index d3692ff..270fb64 100755
--- a/scripts/ectool.sh
+++ b/scripts/ectool.sh
@@ -1,4 +1,5 @@
 #!/usr/bin/env bash
+# SPDX-License-Identifier: GPL-3.0-only
 
 set -e
 cargo build --release --manifest-path tool/Cargo.toml
diff --git a/scripts/power.sh b/scripts/power.sh
index db54a2f..970d588 100755
--- a/scripts/power.sh
+++ b/scripts/power.sh
@@ -1,4 +1,5 @@
 #!/usr/bin/env bash
+# SPDX-License-Identifier: GPL-3.0-only
 
 set -e
 
diff --git a/src/board/system76/common/keymap.c b/src/board/system76/common/keymap.c
index 0111d63..91196df 100644
--- a/src/board/system76/common/keymap.c
+++ b/src/board/system76/common/keymap.c
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-only
+
 #include <board/flash.h>
 #include <board/keymap.h>
 
diff --git a/tool/src/access/hid.rs b/tool/src/access/hid.rs
index cdacd99..f48944b 100644
--- a/tool/src/access/hid.rs
+++ b/tool/src/access/hid.rs
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: MIT
+
 use hidapi::HidDevice;
 
 use crate::{
diff --git a/tool/src/access/lpc/direct.rs b/tool/src/access/lpc/direct.rs
index c474bdc..363f172 100644
--- a/tool/src/access/lpc/direct.rs
+++ b/tool/src/access/lpc/direct.rs
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: MIT
+
 use hwio::{Io, Pio};
 
 use crate::{
diff --git a/tool/src/access/lpc/linux.rs b/tool/src/access/lpc/linux.rs
index 18ea379..ce01302 100644
--- a/tool/src/access/lpc/linux.rs
+++ b/tool/src/access/lpc/linux.rs
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: MIT
+
 use std::{
     fs,
     io::{
diff --git a/tool/src/access/lpc/mod.rs b/tool/src/access/lpc/mod.rs
index 6668de8..dd7eed5 100644
--- a/tool/src/access/lpc/mod.rs
+++ b/tool/src/access/lpc/mod.rs
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: MIT
+
 const SMFI_CMD_BASE: u16 = 0xE00;
 const SMFI_CMD_SIZE: usize = 0x100;
 
diff --git a/tool/src/access/lpc/sim.rs b/tool/src/access/lpc/sim.rs
index 307b93f..4998ba4 100644
--- a/tool/src/access/lpc/sim.rs
+++ b/tool/src/access/lpc/sim.rs
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: MIT
+
 use std::{
     io,
     net::UdpSocket,
@@ -40,7 +42,7 @@ impl AccessLpcSim {
                 "Socket request incorrect size"
             ));
         }
-    
+
         let mut response = [0];
         if self.socket.recv(&mut response)? != response.len() {
             return Err(io::Error::new(
@@ -48,14 +50,14 @@ impl AccessLpcSim {
                 "Socket response incorrect size"
             ));
         }
-    
+
         Ok(response[0])
     }
-    
+
     pub fn inb(&mut self, addr: u16) -> Result<u8, Error> {
         Ok(self.transaction(0x01, addr, 0)?)
     }
-    
+
     pub fn outb(&mut self, addr: u16, value: u8) -> Result<(), Error> {
         self.transaction(0x02, addr, value)?;
         Ok(())
diff --git a/tool/src/access/mod.rs b/tool/src/access/mod.rs
index be12207..cf5b583 100644
--- a/tool/src/access/mod.rs
+++ b/tool/src/access/mod.rs
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: MIT
+
 use crate::Error;
 use downcast_rs::Downcast;
 
diff --git a/tool/src/ec.rs b/tool/src/ec.rs
index f22a2f4..ab82d0b 100644
--- a/tool/src/ec.rs
+++ b/tool/src/ec.rs
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: MIT
+
 #[cfg(not(feature = "std"))]
 use alloc::{
     boxed::Box,
diff --git a/tool/src/error.rs b/tool/src/error.rs
index 2b03e25..1a63836 100644
--- a/tool/src/error.rs
+++ b/tool/src/error.rs
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: MIT
+
 /// Errors returned by operations
 #[derive(Debug)]
 pub enum Error {
diff --git a/tool/src/firmware.rs b/tool/src/firmware.rs
index ba5c28c..e0e674f 100644
--- a/tool/src/firmware.rs
+++ b/tool/src/firmware.rs
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: MIT
+
 /// Parses firmware information from a firmware ROM
 pub struct Firmware<'a> {
     pub board: &'a [u8],
diff --git a/tool/src/legacy.rs b/tool/src/legacy.rs
index ed6cb8c..bc698bc 100644
--- a/tool/src/legacy.rs
+++ b/tool/src/legacy.rs
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: MIT
+
 use crate::{
     Error,
     Pmc,
diff --git a/tool/src/lib.rs b/tool/src/lib.rs
index 1761c7e..a3794cd 100644
--- a/tool/src/lib.rs
+++ b/tool/src/lib.rs
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: MIT
+
 //! Library for accessing System76 ECs
 //! First, construct an access method, using an object implementing the `Access` trait. Next, an Ec
 //! object can be contructed, which exposes the command interface.
diff --git a/tool/src/main.rs b/tool/src/main.rs
index 16cf62c..4e7b9c2 100644
--- a/tool/src/main.rs
+++ b/tool/src/main.rs
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: MIT
+
 use clap::{Arg, App, AppSettings, SubCommand};
 use ectool::{
     Access,
diff --git a/tool/src/pmc.rs b/tool/src/pmc.rs
index 880e401..6ebbc63 100644
--- a/tool/src/pmc.rs
+++ b/tool/src/pmc.rs
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: MIT
+
 use hwio::{Io, Pio};
 
 use crate::{
diff --git a/tool/src/spi.rs b/tool/src/spi.rs
index 5dfa15a..c109e8b 100644
--- a/tool/src/spi.rs
+++ b/tool/src/spi.rs
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: MIT
+
 use crate::{
     Error,
     Timeout,
diff --git a/tool/src/super_io.rs b/tool/src/super_io.rs
index aa441be..56e333d 100644
--- a/tool/src/super_io.rs
+++ b/tool/src/super_io.rs
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: MIT
+
 use hwio::{Io, Pio};
 
 /// Super I/O interface provided by LPC ECs
diff --git a/tool/src/timeout.rs b/tool/src/timeout.rs
index 48e8663..5ee7919 100644
--- a/tool/src/timeout.rs
+++ b/tool/src/timeout.rs
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: MIT
+
 #[cfg(feature = "std")]
 use std::time::{Duration, Instant};