diff --git a/Gruntfile.js b/Gruntfile.js
index 2db5356..4a5e358 100644
--- a/Gruntfile.js
+++ b/Gruntfile.js
@@ -2,7 +2,9 @@ module.exports = function(grunt) {
 	grunt.initConfig({
 		uglify: {
 			options: {
-				preserveComments: 'some',
+				output: {
+					comments: 'some',
+				},
 			},
 			min: {
 				files: {
diff --git a/papaparse.js b/papaparse.js
index 5b5e582..5f92d22 100755
--- a/papaparse.js
+++ b/papaparse.js
@@ -1,4 +1,4 @@
-/*!
+/*@license
 	Papa Parse
 	v4.3.7
 	https://github.com/mholt/PapaParse