diff --git a/slides/k8s/cluster-upgrade.md b/slides/k8s/cluster-upgrade.md
index fcf89145..4fa08593 100644
--- a/slides/k8s/cluster-upgrade.md
+++ b/slides/k8s/cluster-upgrade.md
@@ -232,7 +232,7 @@
 
 ## Checking what we've done
 
-- The API server will be shortly unavailable while kubelet restarts it
+- The API server will be briefly unavailable while kubelet restarts it
 
 .exercise[