Index: modules/node/node.module
===================================================================
RCS file: /cvs/drupal/drupal/modules/node/node.module,v
retrieving revision 1.947.2.15
diff -u -r1.947.2.15 node.module
--- modules/node/node.module	16 Feb 2009 14:39:40 -0000	1.947.2.15
+++ modules/node/node.module	27 Jan 2010 09:39:25 -0000
@@ -7,6 +7,12 @@
  * programmatically submit nodes using the usual form API pattern.
  */
 
+/**
+ * Nodes changed before this time are always marked as read.
+ *
+ * Nodes changed after this time may be marked new, updated, or read, depending
+ * on their state for the current user. Defaults to 30 days ago.
+ */
 define('NODE_NEW_LIMIT', time() - 30 * 24 * 60 * 60);
 
 define('NODE_BUILD_NORMAL', 0);