diff --git a/functional-tools.js b/functional-tools.js
index e4a22ea..310aaae 100644
--- a/functional-tools.js
+++ b/functional-tools.js
@@ -4,7 +4,7 @@
  * @param {string} key
  * @param {string} newValue
  * @param {JSON} json
- * @returns {JSON}
+ * @return {JSON}
  *
  * Example
  * const person = {name: 'James', age: 20, pets: ['dog', 'cat']};