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diff --git a/README.markdown b/README.markdown
index 7055bee..0205678 100644
--- a/README.markdown
+++ b/README.markdown
@@ -4,6 +4,15 @@ doomsh
Use `ulimit` to severely restrict your Bash shell's resources, and see how long
you can last before segfaulting or giving up.
+The author highly recommends you create a dummy user to run this, so that you
+don't end up munging important files in your `HOME`.
+ $ sudo useradd -m doomguy
+ $ sudo -i -u doomguy
+ $ git clone https://sanctum.geek.nz/code/doomsh.git
+ $ cd doomsh
+ $ ./doomsh
Not really important or useful in any way, but kind of fun to see what breaks
when resources are really tight, especially when it exposes problems in
programs like failing to check for NULL returns from `malloc(3)`.