diff --git a/README.md b/README.md
index 2fa5aeade40e0670267157f5f5ba779359eac79d..b4d61630c9919c1d1d8b1ac61f446b31bb9efbff 100644
--- a/README.md
+++ b/README.md
@@ -23,6 +23,8 @@ Use a Ubuntu **20.04** VM to perform level-2 enroll. ArchLinux level-2 enroll is
 
 It's suggested to keep the Ubuntu VM powered-on forever, to keep the certificate valid. 
 
+> Note: modifying `/etc/os-release` might cause problem for dkms. Run `[[ -f /usr/bin/dkms ]] && sed -i 's/sign_file=[^ ]*$/sign_file=Iamnotubuntudonotlookforsignfileplease /g' /usr/bin/dkms` if you are getting dkms error.
+
 ## Move certificates from Level-2 machine to Level-1 machine
 
 > You need to keep your level-2 machine running, or your certificate will invalidate in 1 month.