diff --git a/src/ec/acpi/Makefile.inc b/src/ec/acpi/Makefile.inc
index 34c113b7ea..b3eb1036ec 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 effe34cdda..6af2a1c58e 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 f6c53d3880..1cf88f260b 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 8726b928b5..0152935b85 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-$(CONFIG_EC_GOOGLE_CHROMEEC_AUDIO_CODEC) += audio_codec.c
diff --git a/src/ec/google/chromeec/i2c_tunnel/Makefile.inc b/src/ec/google/chromeec/i2c_tunnel/Makefile.inc
index 85e0fba127..81b91afec1 100644
--- a/src/ec/google/chromeec/i2c_tunnel/Makefile.inc
+++ b/src/ec/google/chromeec/i2c_tunnel/Makefile.inc
@@ -1 +1,2 @@
+## SPDX-License-Identifier: GPL-2.0-only
 ramstage-$(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 c4cef75a9e..58529aeb0a 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-$(CONFIG_EC_GOOGLE_CHROMEEC_MUX) += mux.c
diff --git a/src/ec/google/chromeec/mux/conn/Makefile.inc b/src/ec/google/chromeec/mux/conn/Makefile.inc
index 1f837ca2f8..795baa96e4 100644
--- a/src/ec/google/chromeec/mux/conn/Makefile.inc
+++ b/src/ec/google/chromeec/mux/conn/Makefile.inc
@@ -1 +1,2 @@
+## SPDX-License-Identifier: GPL-2.0-only
 ramstage-$(CONFIG_EC_GOOGLE_CHROMEEC_MUX) += conn.c
diff --git a/src/ec/google/common/Makefile.inc b/src/ec/google/common/Makefile.inc
index 7ab2285ac6..e1e5dfcf22 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-$(CONFIG_EC_GOOGLE_COMMON_MEC) += mec.c
diff --git a/src/ec/google/wilco/Makefile.inc b/src/ec/google/wilco/Makefile.inc
index f17869ecbc..77eab67f03 100644
--- a/src/ec/google/wilco/Makefile.inc
+++ b/src/ec/google/wilco/Makefile.inc
@@ -1,3 +1,4 @@
+## SPDX-License-Identifier: GPL-2.0-only
 ifeq ($(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 6ef87cd992..0d61b5916b 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 e7bafa39e7..e4cdde4ca8 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-$(CONFIG_EC_KONTRON_KEMPLD) += kempld.c
diff --git a/src/ec/lenovo/h8/Makefile.inc b/src/ec/lenovo/h8/Makefile.inc
index 51c11be625..3ac9941da0 100644
--- a/src/ec/lenovo/h8/Makefile.inc
+++ b/src/ec/lenovo/h8/Makefile.inc
@@ -1,3 +1,4 @@
+## SPDX-License-Identifier: GPL-2.0-only
 ifeq ($(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 c7c95c0009..4f8c99f125 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 a3d55532df..5e2b2dfac8 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 a1ae764fc8..8a6c86526b 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 daf75ef1f9..b05db0687a 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 c45f65dcd8..199742c6a0 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 382daa6581..110b997e9a 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