diff --git a/doc/api/cluster.md b/doc/api/cluster.md
index 107d1af76c53d1..cd485124644c5e 100644
--- a/doc/api/cluster.md
+++ b/doc/api/cluster.md
@@ -746,7 +746,7 @@ primary.
 
 The event handler is executed with two arguments, the `worker` contains the
 worker object and the `address` object contains the following connection
-properties: `address`, `port` and `addressType`. This is very useful if the
+properties: `address`, `port`, and `addressType`. This is very useful if the
 worker is listening on more than one address.
 
 ```js