diff --git a/lenovo/t420/4.8-1420-g401f8c59bd/2018-09-06T16_31_10Z/rom_checksum.txt b/lenovo/t420/4.8-1420-g401f8c59bd/2018-09-06T16_31_10Z/rom_checksum.txt
new file mode 100644
index 0000000..e658c76
--- /dev/null
+++ b/lenovo/t420/4.8-1420-g401f8c59bd/2018-09-06T16_31_10Z/rom_checksum.txt
@@ -0,0 +1 @@
+c0f38a60f2484d6d1dfc62d2d48ab8f9 *build/coreboot.rom