diff --git a/cmd/kubeadm/app/cmd/phases/init/markcontrolplane.go b/cmd/kubeadm/app/cmd/phases/init/markcontrolplane.go
index ba05cb7f938..b097f0d728d 100644
--- a/cmd/kubeadm/app/cmd/phases/init/markcontrolplane.go
+++ b/cmd/kubeadm/app/cmd/phases/init/markcontrolplane.go
@@ -27,7 +27,7 @@ import (
 var (
 	markControlPlaneExample = cmdutil.Examples(`
 		# Applies control-plane label and taint to the current node, functionally equivalent to what executed by kubeadm init.
-		kubeadm init phase mark-control-plane --config config.yml
+		kubeadm init phase mark-control-plane --config config.yaml
 
 		# Applies control-plane label and taint to a specific node
 		kubeadm init phase mark-control-plane --node-name myNode
diff --git a/cmd/kubeadm/app/cmd/phases/init/preflight.go b/cmd/kubeadm/app/cmd/phases/init/preflight.go
index 0aab506708f..134ac32192d 100644
--- a/cmd/kubeadm/app/cmd/phases/init/preflight.go
+++ b/cmd/kubeadm/app/cmd/phases/init/preflight.go
@@ -30,7 +30,7 @@ import (
 var (
 	preflightExample = cmdutil.Examples(`
 		# Run pre-flight checks for kubeadm init using a config file.
-		kubeadm init phase preflight --config kubeadm-config.yml
+		kubeadm init phase preflight --config kubeadm-config.yaml
 		`)
 )
 
diff --git a/cmd/kubeadm/app/cmd/phases/join/preflight.go b/cmd/kubeadm/app/cmd/phases/join/preflight.go
index 1da9fdb0ae2..614334607ab 100644
--- a/cmd/kubeadm/app/cmd/phases/join/preflight.go
+++ b/cmd/kubeadm/app/cmd/phases/join/preflight.go
@@ -36,7 +36,7 @@ import (
 var (
 	preflightExample = cmdutil.Examples(`
 		# Run join pre-flight checks using a config file.
-		kubeadm join phase preflight --config kubeadm-config.yml
+		kubeadm join phase preflight --config kubeadm-config.yaml
 		`)
 
 	notReadyToJoinControlPlaneTemp = template.Must(template.New("join").Parse(dedent.Dedent(`