diff --git a/lenovo/t420/4.8-1436-g41979d8/2018-09-07T23_40_08Z/rom_checksum.txt b/lenovo/t420/4.8-1436-g41979d8/2018-09-07T23_40_08Z/rom_checksum.txt
new file mode 100644
index 0000000..575c8f8
--- /dev/null
+++ b/lenovo/t420/4.8-1436-g41979d8/2018-09-07T23_40_08Z/rom_checksum.txt
@@ -0,0 +1 @@
+781d3439e81aa3be007f3f4c4458fe68 *build/coreboot.rom