=== modified file 'diff/diff.module'
--- diff/diff.module	2009-01-27 19:51:46 +0000
+++ diff/diff.module	2009-01-27 19:53:49 +0000
@@ -338,8 +338,10 @@
  *   Node for comparison which will be displayed on the left side.
  * @param $new_node
  *   Node for comparison which will be displayed on the right side.
+ * @param $args
+ *   Arguments passed by other modules, which will assist determining context.
  */
-function _diff_body_rows(&$old_node, &$new_node) {
+function _diff_body_rows(&$old_node, &$new_node, $args = array()) {
   drupal_add_css(drupal_get_path('module', 'diff') .'/diff.css', 'module', 'all', FALSE);
   include_once('DiffEngine.php');
   include_once('node.inc');
@@ -353,6 +355,7 @@
   $rows = array();
   $any_visible_change = FALSE;
   $node_diffs = module_invoke_all('diff', $old_node, $new_node);
+  drupal_alter('diff', $node_diffs, $args);
   
   // We start off assuming all form elements are in the correct order.
   $node_diffs['#sorted'] = TRUE;