diff --git a/util/dell-flash-unlock/README.md b/util/dell-flash-unlock/README.md
index 7d9b4b85e4153d7c19ec5c83573947889c4247e9..fd000efc20bda13b154e45a26d95e0fb040cc720 100644
--- a/util/dell-flash-unlock/README.md
+++ b/util/dell-flash-unlock/README.md
@@ -8,6 +8,8 @@ E6400, which mainly seem to be the Latitude and Precision lines starting from
 around 2008 (E6400 era).
 
 ## TL;DR
+On Linux, ensure you are booting with the `iomem=relaxed` kernel parameter.
+On OpenBSD, ensure you are booting with securelevel set to -1.
 Run `make` to compile the utility, and then run `sudo ./dell_flash_unlock` and
 follow the directions it outputs.