diff --git a/config.js.example b/config.js.example
index b430026..d3c99f8 100644
--- a/config.js.example
+++ b/config.js.example
@@ -7,7 +7,8 @@ module.exports = {
   port: "8080",
 
   // Clusters.
-  clusters: 4,
+  // 0 will make bostr run clusters with available parallelism / CPU cores.
+  clusters: 0,
 
   // Log about bouncer connection with relays? 
   log_about_relays: false,