diff --git a/main.go b/main.go
index e482500..ea4baf2 100644
--- a/main.go
+++ b/main.go
@@ -19,7 +19,10 @@ func main() {
 			Aliases: []string{"u"},
 			Usage:   "Scan a directory's manifests",
 			Action: func(c *cli.Context) error {
-				return scan(c)
+				if len(c.Args()) > 0 {
+					return scan(c)
+				}
+				return cli.NewExitError("no directory provided", 5)
 			},
 		},
 	}