diff --git a/doc/api/cluster.markdown b/doc/api/cluster.markdown
index 1b0aff2424..f510468c89 100644
--- a/doc/api/cluster.markdown
+++ b/doc/api/cluster.markdown
@@ -642,6 +642,7 @@ cluster.setupMaster({
 });
 cluster.fork(); // https worker
 cluster.setupMaster({
+  exec: 'worker.js',
   args: ['--use', 'http']
 });
 cluster.fork(); // http worker