diff --git a/cli/app/undeploy.go b/cli/app/undeploy.go
index cbf8a770..c54aff41 100644
--- a/cli/app/undeploy.go
+++ b/cli/app/undeploy.go
@@ -24,10 +24,10 @@ var pruneFlag = &cli.BoolFlag{
 	Usage:       "Prunes unused containers, networks, and dangling images for an app",
 }
 
-// pruneSystem runs the equivalent of a "docker system prune" after an undeploy
-// in order to clean up left over state related to the deployment. Volumes are
-// not pruned to avoid unwated data loss.
-func pruneSystem(c *cli.Context, cl *dockerClient.Client, app config.App) error {
+// pruneApp runs the equivalent of a "docker system prune" but only filtering
+// against resources connected with the app deployment. It is not a system wide
+// prune. Volumes are not pruned to avoid unwated data loss.
+func pruneApp(c *cli.Context, cl *dockerClient.Client, app config.App) error {
 	stackName := app.StackName()
 	ctx := context.Background()
 
@@ -123,7 +123,7 @@ Passing "-p/--prune" does not remove those volumes.
 		}
 
 		if prune {
-			if err := pruneSystem(c, cl, app); err != nil {
+			if err := pruneApp(c, cl, app); err != nil {
 				logrus.Fatal(err)
 			}
 		}