diff --git a/docs/concepts/overview/working-with-objects/labels.md b/docs/concepts/overview/working-with-objects/labels.md
index c391026c7c7f4..0ab6a3deeea45 100644
--- a/docs/concepts/overview/working-with-objects/labels.md
+++ b/docs/concepts/overview/working-with-objects/labels.md
@@ -58,6 +58,7 @@ An empty label selector (that is, one with zero requirements) selects every obje
 A null label selector (which is only possible for optional selector fields) selects no objects.
 
 **Note**: the label selectors of two controllers must not overlap within a namespace, otherwise they will fight with each other.
+{: .note}
 
 ### _Equality-based_ requirement