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diff --git a/src/dotnet-library/scala/collection/jcl/IdentityHashMap.scala b/src/dotnet-library/scala/collection/jcl/IdentityHashMap.scala
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+++ b/src/dotnet-library/scala/collection/jcl/IdentityHashMap.scala
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+/*                     __                                               *\
+**     ________ ___   / /  ___     Scala API                            **
+**    / __/ __// _ | / /  / _ |    (c) 2006-2007, LAMP/EPFL             **
+**  __\ \/ /__/ __ |/ /__/ __ |                                         **
+** /____/\___/_/ |_/____/_/ | |                                         **
+**                          |/                                          **
+\*                                                                      */
+
+// $Id$
+
+package scala.collection.jcl;
+
+/** A map that is backed by a Java identity hash map, which compares keys
+ *  by their reference-based identity as opposed to using equals and hashCode.
+ *  An identity hash map will often perform better than traditional hash map
+ *  because it can utilize linear probing.
+ *
+ *  @author Sean McDirmid
+ */
+class IdentityHashMap[K,E](override val underlying : java.util.IdentityHashMap) extends MapWrapper[K,E] {
+  def this() = this(new java.util.IdentityHashMap);
+}