diff --git a/lib/utils.js b/lib/utils.js
index 6388d61..ec15740 100644
--- a/lib/utils.js
+++ b/lib/utils.js
@@ -1,3 +1,10 @@
+/*!
+ * regexparam v2.0.2
+ * https://github.com/lukeed/regexparam
+ *
+ * Copyright (c) Luke Edwards <luke.edwards05@gmail.com> (lukeed.com)
+ * Released under the MIT license
+ */
 function regexToParams(str, loose) {
   if (str instanceof RegExp) return { keys: false, pattern: str };