diff --git a/src/type-rules.js b/src/type-rules.js
index 7dd67c9..050dd6d 100644
--- a/src/type-rules.js
+++ b/src/type-rules.js
@@ -1,6 +1,7 @@
 "use strict";
 
 /* TODO: Implement .unique */
+/* TODO: Implement enums */
 
 function createTypeRule(props) {
 	return Object.assign(props, {