diff --git a/pkg/kubectl/cmd/apply.go b/pkg/kubectl/cmd/apply.go
index fd92a9cc757..9ec2dac0d22 100644
--- a/pkg/kubectl/cmd/apply.go
+++ b/pkg/kubectl/cmd/apply.go
@@ -78,7 +78,14 @@ var (
 		kubectl apply -f ./pod.json
 
 		# Apply the JSON passed into stdin to a pod.
-		cat pod.json | kubectl apply -f -`)
+		cat pod.json | kubectl apply -f -
+
+		# Note: --prune is still in Alpha
+		# Apply the configuration in manifest.yaml that matches label app=nginx and delete all the other resources that are not in the file and match label app=nginx.
+		kubectl apply --prune -f manifest.yaml -l app=nginx
+
+		# Apply the configuration in manifest.yaml and delete all the other configmaps that are not in the file.
+		kubectl apply --prune -f manifest.yaml --all --prune-whitelist=core/v1/ConfigMap`)
 )
 
 func NewCmdApply(f cmdutil.Factory, out io.Writer) *cobra.Command {
@@ -101,10 +108,10 @@ func NewCmdApply(f cmdutil.Factory, out io.Writer) *cobra.Command {
 	cmdutil.AddFilenameOptionFlags(cmd, &options.FilenameOptions, usage)
 	cmd.MarkFlagRequired("filename")
 	cmd.Flags().Bool("overwrite", true, "Automatically resolve conflicts between the modified and live configuration by using values from the modified configuration")
-	cmd.Flags().BoolVar(&options.Prune, "prune", false, "Automatically delete resource objects that do not appear in the configs")
-	cmd.Flags().BoolVar(&options.Cascade, "cascade", true, "Only relevant during a prune. If true, cascade the deletion of the resources managed by pruned resources (e.g. Pods created by a ReplicationController).")
-	cmd.Flags().IntVar(&options.GracePeriod, "grace-period", -1, "Period of time in seconds given to pruned resources to terminate gracefully. Ignored if negative.")
-	cmd.Flags().BoolVar(&options.Force, "force", false, "Delete and re-create the specified resource")
+	cmd.Flags().BoolVar(&options.Prune, "prune", false, "Automatically delete resource objects that do not appear in the configs and are created by either apply or create --save-config. Should be used with either -l or --all.")
+	cmd.Flags().BoolVar(&options.Cascade, "cascade", true, "Only relevant during a prune or a force apply. If true, cascade the deletion of the resources managed by pruned or deleted resources (e.g. Pods created by a ReplicationController).")
+	cmd.Flags().IntVar(&options.GracePeriod, "grace-period", -1, "Only relevant during a prune or a force apply. Period of time in seconds given to pruned or deleted resources to terminate gracefully. Ignored if negative.")
+	cmd.Flags().BoolVar(&options.Force, "force", false, fmt.Sprintf("Delete and re-create the specified resource, when PATCH encounters conflict and has retried for %d times.", maxPatchRetry))
 	cmd.Flags().DurationVar(&options.Timeout, "timeout", 0, "Only relevant during a force apply. The length of time to wait before giving up on a delete of the old resource, zero means determine a timeout from the size of the object. Any other values should contain a corresponding time unit (e.g. 1s, 2m, 3h).")
 	cmdutil.AddValidateFlags(cmd)
 	cmd.Flags().StringVarP(&options.Selector, "selector", "l", "", "Selector (label query) to filter on")