diff --git a/slides/common/prereqs.md b/slides/common/prereqs.md
index c13d38b0..bbc190bc 100644
--- a/slides/common/prereqs.md
+++ b/slides/common/prereqs.md
@@ -159,7 +159,7 @@ class: in-person
 
 <!--
 ```bash
-for N in $(seq 1 5); do
+for N in $(awk '/node/{print $2}' /etc/hosts); do
   ssh -o StrictHostKeyChecking=no node$N true
 done
 ```