Index: src/java/org/apache/lucene/document/Document.java
===================================================================
--- src/java/org/apache/lucene/document/Document.java	(revision 962932)
+++ src/java/org/apache/lucene/document/Document.java	(working copy)
@@ -37,13 +38,26 @@
  */
 
 public final class Document implements java.io.Serializable {
-  List<Fieldable> fields = new ArrayList<Fieldable>();
+  final List<Fieldable> fields;
   private float boost = 1.0f;
 
   /** Constructs a new document with no fields. */
-  public Document() {}
+  public Document() {
+    this(new ArrayList<Fieldable>());
+  }
+  
+  /** Construct a Document with an initial capacity for its Fielable list
+   * @param initialCapacity   initial number of fields in the internal List */
+  public Document(final int initialCapacity) {
+    this(new ArrayList<Fieldable>(initialCapacity));
+  }
+  
+  /** Construct a Document with a List of Fieldables
+   * @param fields  a List of Fielables to use. NOT COPIED, so be careful */
+  public Document(final List<Fieldable> fields) {
+    this.fields = fields;
+  }
 
-
   /** Sets a boost factor for hits on any field of this document.  This value
    * will be multiplied into the score of all hits on this document.
    *