diff --git a/src/ec/acpi/Makefile.inc b/src/ec/acpi/Makefile.inc
index 34c113b..b3eb103 100644
--- a/src/ec/acpi/Makefile.inc
+++ b/src/ec/acpi/Makefile.inc
@@ -1,3 +1,4 @@
+## SPDX-License-Identifier: GPL-2.0-only
 ifeq ($(CONFIG_EC_ACPI),y)
 
 bootblock-y += ec.c
diff --git a/src/ec/compal/ene932/Makefile.inc b/src/ec/compal/ene932/Makefile.inc
index effe34c..6af2a1c 100644
--- a/src/ec/compal/ene932/Makefile.inc
+++ b/src/ec/compal/ene932/Makefile.inc
@@ -1,3 +1,4 @@
+## SPDX-License-Identifier: GPL-2.0-only
 ifeq ($(CONFIG_EC_COMPAL_ENE932),y)
 
 ramstage-y += ec.c
diff --git a/src/ec/google/chromeec/Makefile.inc b/src/ec/google/chromeec/Makefile.inc
index f6c53d3..1cf88f2 100644
--- a/src/ec/google/chromeec/Makefile.inc
+++ b/src/ec/google/chromeec/Makefile.inc
@@ -1,3 +1,4 @@
+## SPDX-License-Identifier: GPL-2.0-only
 ifeq ($(CONFIG_EC_GOOGLE_CHROMEEC),y)
 
 subdirs-y += audio_codec
diff --git a/src/ec/google/chromeec/audio_codec/Makefile.inc b/src/ec/google/chromeec/audio_codec/Makefile.inc
index 8726b92..0152935 100644
--- a/src/ec/google/chromeec/audio_codec/Makefile.inc
+++ b/src/ec/google/chromeec/audio_codec/Makefile.inc
@@ -1 +1,2 @@
+## SPDX-License-Identifier: GPL-2.0-only
 ramstage-$(CONFIG_EC_GOOGLE_CHROMEEC_AUDIO_CODEC) += audio_codec.c
diff --git a/src/ec/google/chromeec/i2c_tunnel/Makefile.inc b/src/ec/google/chromeec/i2c_tunnel/Makefile.inc
index 85e0fba..81b91af 100644
--- a/src/ec/google/chromeec/i2c_tunnel/Makefile.inc
+++ b/src/ec/google/chromeec/i2c_tunnel/Makefile.inc
@@ -1 +1,2 @@
+## SPDX-License-Identifier: GPL-2.0-only
 ramstage-$(CONFIG_EC_GOOGLE_CHROMEEC_I2C_TUNNEL) += i2c_tunnel.c
diff --git a/src/ec/google/chromeec/mux/Makefile.inc b/src/ec/google/chromeec/mux/Makefile.inc
index c4cef75..58529aeb 100644
--- a/src/ec/google/chromeec/mux/Makefile.inc
+++ b/src/ec/google/chromeec/mux/Makefile.inc
@@ -1,2 +1,3 @@
+## SPDX-License-Identifier: GPL-2.0-only
 subdirs-y += conn
 ramstage-$(CONFIG_EC_GOOGLE_CHROMEEC_MUX) += mux.c
diff --git a/src/ec/google/chromeec/mux/conn/Makefile.inc b/src/ec/google/chromeec/mux/conn/Makefile.inc
index 1f837ca..795baa9 100644
--- a/src/ec/google/chromeec/mux/conn/Makefile.inc
+++ b/src/ec/google/chromeec/mux/conn/Makefile.inc
@@ -1 +1,2 @@
+## SPDX-License-Identifier: GPL-2.0-only
 ramstage-$(CONFIG_EC_GOOGLE_CHROMEEC_MUX) += conn.c
diff --git a/src/ec/google/common/Makefile.inc b/src/ec/google/common/Makefile.inc
index 7ab2285..e1e5dfc 100644
--- a/src/ec/google/common/Makefile.inc
+++ b/src/ec/google/common/Makefile.inc
@@ -1,3 +1,4 @@
+## SPDX-License-Identifier: GPL-2.0-only
 bootblock-$(CONFIG_EC_GOOGLE_COMMON_MEC) += mec.c
 verstage-$(CONFIG_EC_GOOGLE_COMMON_MEC) += mec.c
 romstage-$(CONFIG_EC_GOOGLE_COMMON_MEC) += mec.c
diff --git a/src/ec/google/wilco/Makefile.inc b/src/ec/google/wilco/Makefile.inc
index f17869e..77eab67 100644
--- a/src/ec/google/wilco/Makefile.inc
+++ b/src/ec/google/wilco/Makefile.inc
@@ -1,3 +1,4 @@
+## SPDX-License-Identifier: GPL-2.0-only
 ifeq ($(CONFIG_EC_GOOGLE_WILCO),y)
 
 bootblock-y += bootblock.c commands.c mailbox.c
diff --git a/src/ec/kontron/it8516e/Makefile.inc b/src/ec/kontron/it8516e/Makefile.inc
index 6ef87cd..0d61b59 100644
--- a/src/ec/kontron/it8516e/Makefile.inc
+++ b/src/ec/kontron/it8516e/Makefile.inc
@@ -1,3 +1,4 @@
+## SPDX-License-Identifier: GPL-2.0-only
 ifeq ($(CONFIG_EC_KONTRON_IT8516E),y)
 
 ramstage-y += ec.c
diff --git a/src/ec/kontron/kempld/Makefile.inc b/src/ec/kontron/kempld/Makefile.inc
index e7bafa3..e4cdde4 100644
--- a/src/ec/kontron/kempld/Makefile.inc
+++ b/src/ec/kontron/kempld/Makefile.inc
@@ -1,3 +1,4 @@
+## SPDX-License-Identifier: GPL-2.0-only
 bootblock-$(CONFIG_EC_KONTRON_KEMPLD) += early_kempld.c
 ramstage-$(CONFIG_EC_KONTRON_KEMPLD) += early_kempld.c
 ramstage-$(CONFIG_EC_KONTRON_KEMPLD) += kempld.c
diff --git a/src/ec/lenovo/h8/Makefile.inc b/src/ec/lenovo/h8/Makefile.inc
index 51c11be..3ac9941 100644
--- a/src/ec/lenovo/h8/Makefile.inc
+++ b/src/ec/lenovo/h8/Makefile.inc
@@ -1,3 +1,4 @@
+## SPDX-License-Identifier: GPL-2.0-only
 ifeq ($(CONFIG_EC_LENOVO_H8),y)
 
 ramstage-y += sense.c
diff --git a/src/ec/lenovo/pmh7/Makefile.inc b/src/ec/lenovo/pmh7/Makefile.inc
index c7c95c0..4f8c99f 100644
--- a/src/ec/lenovo/pmh7/Makefile.inc
+++ b/src/ec/lenovo/pmh7/Makefile.inc
@@ -1,3 +1,4 @@
+## SPDX-License-Identifier: GPL-2.0-only
 ifeq ($(CONFIG_EC_LENOVO_PMH7),y)
 
 bootblock-y += pmh7.c
diff --git a/src/ec/purism/librem-ec/Makefile.inc b/src/ec/purism/librem-ec/Makefile.inc
index a3d5553..5e2b2df 100644
--- a/src/ec/purism/librem-ec/Makefile.inc
+++ b/src/ec/purism/librem-ec/Makefile.inc
@@ -1,3 +1,4 @@
+## SPDX-License-Identifier: GPL-2.0-only
 ifeq ($(CONFIG_EC_LIBREM_EC),y)
 
 all-y += ../../system76/ec/system76_ec.c
diff --git a/src/ec/quanta/ene_kb3940q/Makefile.inc b/src/ec/quanta/ene_kb3940q/Makefile.inc
index a1ae764..8a6c865 100644
--- a/src/ec/quanta/ene_kb3940q/Makefile.inc
+++ b/src/ec/quanta/ene_kb3940q/Makefile.inc
@@ -1,3 +1,4 @@
+## SPDX-License-Identifier: GPL-2.0-only
 ifeq ($(CONFIG_EC_QUANTA_ENE_KB3940Q),y)
 
 ramstage-y += ec.c
diff --git a/src/ec/quanta/it8518/Makefile.inc b/src/ec/quanta/it8518/Makefile.inc
index daf75ef..b05db06 100644
--- a/src/ec/quanta/it8518/Makefile.inc
+++ b/src/ec/quanta/it8518/Makefile.inc
@@ -1,3 +1,4 @@
+## SPDX-License-Identifier: GPL-2.0-only
 ifeq ($(CONFIG_EC_QUANTA_IT8518),y)
 
 romstage-y += ec.c
diff --git a/src/ec/smsc/mec1308/Makefile.inc b/src/ec/smsc/mec1308/Makefile.inc
index c45f65d..199742c 100644
--- a/src/ec/smsc/mec1308/Makefile.inc
+++ b/src/ec/smsc/mec1308/Makefile.inc
@@ -1,3 +1,4 @@
+## SPDX-License-Identifier: GPL-2.0-only
 ifeq ($(CONFIG_EC_SMSC_MEC1308),y)
 
 ramstage-y += ec.c
diff --git a/src/ec/system76/ec/Makefile.inc b/src/ec/system76/ec/Makefile.inc
index 382daa6..110b997 100644
--- a/src/ec/system76/ec/Makefile.inc
+++ b/src/ec/system76/ec/Makefile.inc
@@ -1,3 +1,4 @@
+## SPDX-License-Identifier: GPL-2.0-only
 ifeq ($(CONFIG_EC_SYSTEM76_EC),y)
 
 all-y += system76_ec.c