diff --git a/hadoop-yarn-project/CHANGES.txt b/hadoop-yarn-project/CHANGES.txt
index 3458b2ceba7..a03a63d79c5 100644
--- a/hadoop-yarn-project/CHANGES.txt
+++ b/hadoop-yarn-project/CHANGES.txt
@@ -80,6 +80,8 @@ Release 2.6.0 - UNRELEASED
     YARN-1994. Expose YARN/MR endpoints on multiple interfaces. (Craig Welch,
     Milan Potocnik, Arpit Agarwal via xgong)
 
+    YARN-2343. Improve NMToken expire exception message. (Li Lu via jianhe)
+
   OPTIMIZATIONS
 
   BUG FIXES
diff --git a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/main/java/org/apache/hadoop/yarn/server/nodemanager/containermanager/ContainerManagerImpl.java b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/main/java/org/apache/hadoop/yarn/server/nodemanager/containermanager/ContainerManagerImpl.java
index 0625df0edde..7922fe2ce06 100644
--- a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/main/java/org/apache/hadoop/yarn/server/nodemanager/containermanager/ContainerManagerImpl.java
+++ b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/main/java/org/apache/hadoop/yarn/server/nodemanager/containermanager/ContainerManagerImpl.java
@@ -514,6 +514,8 @@ public class ContainerManagerImpl extends CompositeService implements
       messageBuilder.append("\nThis token is expired. current time is ")
         .append(System.currentTimeMillis()).append(" found ")
         .append(containerTokenIdentifier.getExpiryTimeStamp());
+      messageBuilder.append("\nNote: System times on machines may be out of sync.")
+        .append(" Check system time and time zones.");
     }
     if (unauthorized) {
       String msg = messageBuilder.toString();