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diff --git a/src/library/scalax/collection/BufferedIterator.scala b/src/library/scalax/collection/BufferedIterator.scala
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+/*                     __                                               *\
+**     ________ ___   / /  ___     Scala API                            **
+**    / __/ __// _ | / /  / _ |    (c) 2003-2007, LAMP/EPFL             **
+**  __\ \/ /__/ __ |/ /__/ __ |    http://scala-lang.org/               **
+** /____/\___/_/ |_/____/_/ | |                                         **
+**                          |/                                          **
+\*                                                                      */
+
+// $Id: BufferedIterator.scala 12641 2007-08-22 16:01:57Z mcdirmid $
+
+
+package scalax.collection
+
+/** Buffered iterators are iterators which allow to inspect the next
+ *  element without discarding it.
+ *
+ *  @author  Martin Odersky
+ *  @version 2.8
+ */
+trait BufferedIterator[+A] extends Iterator[A] {
+
+  /** Returns current element of iterator without advancing beyond it.
+   */
+  def head: A
+
+  override def buffered: this.type = this
+}