diff --git a/src/main/java/org/jboss/netty/channel/DefaultChannelPipeline.java b/src/main/java/org/jboss/netty/channel/DefaultChannelPipeline.java
index 060620242c..da726f6cca 100644
--- a/src/main/java/org/jboss/netty/channel/DefaultChannelPipeline.java
+++ b/src/main/java/org/jboss/netty/channel/DefaultChannelPipeline.java
@@ -665,7 +665,7 @@ public class DefaultChannelPipeline implements ChannelPipeline {
 
     private void checkDuplicateName(String name) {
         if (name2ctx.containsKey(name)) {
-            throw new IllegalArgumentException("Duplicate handler name.");
+            throw new IllegalArgumentException("Duplicate handler name: " + name);
         }
     }