diff --git a/12-switch/exercises/02-richter-scale-2/main.go b/12-switch/exercises/02-richter-scale-2/main.go
index 3902b51..9c5d861 100644
--- a/12-switch/exercises/02-richter-scale-2/main.go
+++ b/12-switch/exercises/02-richter-scale-2/main.go
@@ -35,7 +35,7 @@ package main
 //  go run main.go
 //   Tell me the magnitude of the earthquake in human terms.
 //
-//  go run main.go aliens
+//  go run main.go alien
 //   alien's richter scale is unknown
 //
 //  go run main.go micro