diff --git a/doc/api/cluster.md b/doc/api/cluster.md
index fac182ba7be8a9..f71f91535c52df 100644
--- a/doc/api/cluster.md
+++ b/doc/api/cluster.md
@@ -191,7 +191,7 @@ added: v0.7.0
 
 Similar to the `cluster.on('message')` event, but specific to this worker.
 
-Within a worker, `process.on('message)` may also be used.
+Within a worker, `process.on('message')` may also be used.
 
 See [`process` event: `'message'`][].