diff --git a/expire.node_reference.inc b/expire.node_reference.inc
index 8f6592ef908943785c40ba1234db47f68b24035b..50c1e480a8500a3ae1a9d8ce56106f7bf9fd11a9 100644
--- a/expire.node_reference.inc
+++ b/expire.node_reference.inc
@@ -1,12 +1,20 @@
 <?php
 
+/**
+ * Get a list of nodes linked to the passed node via node_reference.
+ *
+ * @param $node
+ *  node object
+ *
+ * @return $paths
+ *   an array of node paths
+ */
 function expire_get_node_references($node)  {
   $paths = array();
   $fields= field_info_instances('node', $node->type);
   $field_types = field_info_fields();
+  // Loop over the fields of this node.  If the field is a node_reference field, add any referenced nodes to $paths
   foreach ($fields as $field) {
-    // Add referenced node paths and expire referenced nodes
-    // when the referencing node is updated.
     if ($field_types[$field['field_name']]['type'] == 'node_reference') {
       $node_field = isset($node->$field['field_name']) && !empty($node->$field['field_name']) ? $node->$field['field_name'] : array();
       foreach($node_field[LANGUAGE_NONE] as $reference) {