diff --git a/apm-collector/apm-collector-cluster/src/main/java/org/skywalking/apm/collector/actor/WorkerInvokeException.java b/apm-collector/apm-collector-cluster/src/main/java/org/skywalking/apm/collector/actor/WorkerInvokeException.java
index 62a3742fc..021dbec0f 100644
--- a/apm-collector/apm-collector-cluster/src/main/java/org/skywalking/apm/collector/actor/WorkerInvokeException.java
+++ b/apm-collector/apm-collector-cluster/src/main/java/org/skywalking/apm/collector/actor/WorkerInvokeException.java
@@ -1,7 +1,7 @@
 package org.skywalking.apm.collector.actor;
 
 /**
- * This exception is raised when call (or ask) worker.
+ * This exception is raised when worker fails to process job during "call" or "ask" 
  *
  * @author pengys5
  * @since v3.1-2017