diff --git a/src/java/org/apache/commons/graph/DFS.java b/src/java/org/apache/commons/graph/DFS.java
index 737818b..993b6ec 100644
--- a/src/java/org/apache/commons/graph/DFS.java
+++ b/src/java/org/apache/commons/graph/DFS.java
@@ -59,8 +59,15 @@ import org.apache.commons.graph.visitor.Visitor;
 /**
  * Visit graph with depth first search and mark discovery and finishing time in all
  * vertices.
+ * 
+ * Definition of a DFS:
+ * (1) Any search algorithm which considers outgoing edges of a vertex before 
+ * any neighbors of the vertex, that is, outgoing edges of the vertex's predecessor in
+ * the search. Extremes are searched first. This is easily implemented with recursion.
+ * (2) An algorithm which marks all vertices in a directed graph in the order they are
+ * discovered and finished, partitioning the graph into a forest.
  *
- * @version $Id: DFS.java,v 1.2 2001/11/29 14:17:33 jvanzyl Exp $
+ * @version $Id: DFS.java,v 1.3 2001/12/01 19:02:07 jvanzyl Exp $
  * @author  <A HREF="http://www.inf.fu-berlin.de/~dahm">M. Dahm</A>
  */
 public class DFS extends TraversalOrder {