diff --git a/doc/api/cluster.md b/doc/api/cluster.md
index 5f65fb7f7ce8ed..7270a4e580bf7c 100644
--- a/doc/api/cluster.md
+++ b/doc/api/cluster.md
@@ -131,7 +131,7 @@ Node.js process and a cluster worker differs:
    port is random the first time, but predictable thereafter. To listen
    on a unique port, generate a port number based on the cluster worker ID.
 
-Node.js does not provide routing logic. It is, therefore important to design an
+Node.js does not provide routing logic. It is therefore important to design an
 application such that it does not rely too heavily on in-memory data objects for
 things like sessions and login.