diff --git a/concurrent/Summing4.java b/concurrent/Summing4.java
index 0959d3e8..4df90323 100644
--- a/concurrent/Summing4.java
+++ b/concurrent/Summing4.java
@@ -2,7 +2,7 @@
 // (c)2017 MindView LLC: see Copyright.txt
 // We make no guarantees that this code is fit for any purpose.
 // Visit http://OnJava8.com for more book information.
-// !!!!
+// {ExcludeFromTravisCI}
 import java.util.*;
 
 public class Summing4 {