diff --git a/src/java/org/apache/lucene/util/StringHelper.java b/src/java/org/apache/lucene/util/StringHelper.java
index d464f25c7e2..a4f46c5873d 100644
--- a/src/java/org/apache/lucene/util/StringHelper.java
+++ b/src/java/org/apache/lucene/util/StringHelper.java
@@ -1,24 +1,42 @@
 package org.apache.lucene.util;
 
+/**
+ * Copyright 2004 The Apache Software Foundation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
 
 
 /**
- * Methods for manipulating strings
+ * Methods for manipulating strings.
  *
- **/
+ * $Id$
+ */
 public abstract class StringHelper {
-  
+
   /**
-   * 
+   * Compares two strings, character by character, and returns the
+   * first position where the two strings differ from one another.
+   *
    * @param s1 The first string to compare
    * @param s2 The second string to compare
    * @return The first position where the two strings differ.
-   */ 
+   */
   public static final int stringDifference(String s1, String s2) {
     int len1 = s1.length();
     int len2 = s2.length();
     int len = len1 < len2 ? len1 : len2;
-    for (int i = 0; i < len; i++) {   
+    for (int i = 0; i < len; i++) {
       if (s1.charAt(i) != s2.charAt(i)) {
 	      return i;
       }