diff --git a/util/mainboard/google/dalboz/template/spd/Makefile.inc b/util/mainboard/google/dalboz/template/spd/Makefile.inc
index feabe7fe37..3edeb9606c 100644
--- a/util/mainboard/google/dalboz/template/spd/Makefile.inc
+++ b/util/mainboard/google/dalboz/template/spd/Makefile.inc
@@ -1,4 +1,5 @@
 ## SPDX-License-Identifier: GPL-2.0-or-later
 ## This is an auto-generated file. Do not edit!!
+## Add memory parts in mem_parts_used.txt and run spd_tools to regenerate.
 
-SPD_SOURCES =
+SPD_SOURCES = ddr4-spd-empty.hex
diff --git a/util/mainboard/google/trembyle/template/spd/Makefile.inc b/util/mainboard/google/trembyle/template/spd/Makefile.inc
index feabe7fe37..3edeb9606c 100644
--- a/util/mainboard/google/trembyle/template/spd/Makefile.inc
+++ b/util/mainboard/google/trembyle/template/spd/Makefile.inc
@@ -1,4 +1,5 @@
 ## SPDX-License-Identifier: GPL-2.0-or-later
 ## This is an auto-generated file. Do not edit!!
+## Add memory parts in mem_parts_used.txt and run spd_tools to regenerate.
 
-SPD_SOURCES =
+SPD_SOURCES = ddr4-spd-empty.hex