diff --git a/stringer.go b/stringer.go
index d4479ea..6c267e5 100644
--- a/stringer.go
+++ b/stringer.go
@@ -86,7 +86,7 @@ func main() {
 	}
 
 	// Print the header and package clause.
-	g.Printf("// Code generated by \"enumer %s\"; DO NOT EDIT\n", strings.Join(os.Args[1:], " "))
+	g.Printf("// Code generated by \"enumer %s\"; DO NOT EDIT.\n", strings.Join(os.Args[1:], " "))
 	g.Printf("\n")
 	g.Printf("package %s", g.pkg.name)
 	g.Printf("\n")