From 59899e1c820cd3fb8789b9cf8648b269b97763be Mon Sep 17 00:00:00 2001
From: Thomas Neidhart <tn@apache.org>
Date: Wed, 27 Nov 2013 21:50:47 +0000
Subject: [PATCH] Add message to exception.

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/collections/trunk@1546206 13f79535-47bb-0310-9956-ffa450edef68
---
 .../apache/commons/collections4/iterators/PeekingIterator.java  | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/main/java/org/apache/commons/collections4/iterators/PeekingIterator.java b/src/main/java/org/apache/commons/collections4/iterators/PeekingIterator.java
index 230d41903..fb4cf92cb 100644
--- a/src/main/java/org/apache/commons/collections4/iterators/PeekingIterator.java
+++ b/src/main/java/org/apache/commons/collections4/iterators/PeekingIterator.java
@@ -151,7 +151,7 @@ public class PeekingIterator<E> implements Iterator<E> {
      */
     public void remove() {
         if (slotFilled) {
-            throw new IllegalStateException();
+            throw new IllegalStateException("peek() or element() called before remove()");
         }
         iterator.remove();
     }