diff --git a/slides/kube/namespaces.md b/slides/kube/namespaces.md
index 110ee4f5..00caedac 100644
--- a/slides/kube/namespaces.md
+++ b/slides/kube/namespaces.md
@@ -18,7 +18,7 @@
 
 --
 
-- In other words: <mark>the tuple *(type, name, namespace)* needs to be unique</mark>
+- In other words: **the tuple *(type, name, namespace)* needs to be unique**
 
   (In the resource YAML, the type is called `Kind`)