diff --git a/cmd/stringer/stringer.go b/cmd/stringer/stringer.go
index 992125ab..1d8fa9ae 100644
--- a/cmd/stringer/stringer.go
+++ b/cmd/stringer/stringer.go
@@ -89,7 +89,7 @@ var (
 func Usage() {
 	fmt.Fprintf(os.Stderr, "Usage of %s:\n", os.Args[0])
 	fmt.Fprintf(os.Stderr, "\tstringer [flags] -type T [directory]\n")
-	fmt.Fprintf(os.Stderr, "\tstringer [flags[ -type T files... # Must be a single package\n")
+	fmt.Fprintf(os.Stderr, "\tstringer [flags] -type T files... # Must be a single package\n")
 	fmt.Fprintf(os.Stderr, "For more information, see:\n")
 	fmt.Fprintf(os.Stderr, "\thttp://godoc.org/golang.org/x/tools/cmd/stringer\n")
 	fmt.Fprintf(os.Stderr, "Flags:\n")