diff --git a/content_access.admin.inc b/content_access.admin.inc
index 0827cac..5d15b73 100644
--- a/content_access.admin.inc
+++ b/content_access.admin.inc
@@ -86,15 +86,16 @@ function content_access_page_submit($form, &$form_state) {
 
   if (module_exists('acl')) {
     foreach (array('view', 'update', 'delete') as $op) {
+      $ids_before = acl_get_uids($form_state['values']['acl'][$op]['acl_id']);
       acl_save_form($form_state['values']['acl'][$op]);
-      module_invoke_all('user_acl', $settings);
+      module_invoke_all('user_acl', $node, $op, $ids_before, acl_get_uids($form_state['values']['acl'][$op]['acl_id']));
     }
   }
 
   // Apply new settings.
   node_access_acquire_grants($node);
 
-  module_invoke_all('per_node', $settings);
+  module_invoke_all('per_node', $node, $settings);
 
   drupal_set_message(t('Your changes have been saved.'));
 }
@@ -344,4 +345,4 @@ function content_access_user_admin_perm_submit($form, $form_state) {
       array('@types' => implode(', ', $types))
     ));
   }
-}
\ No newline at end of file
+}
diff --git a/content_access_rules/content_access_rules.module b/content_access_rules/content_access_rules.module
index e63631d..6ad29a7 100644
--- a/content_access_rules/content_access_rules.module
+++ b/content_access_rules/content_access_rules.module
@@ -9,19 +9,19 @@
  * Implements hook_content_type_access().
  */
 function content_access_rules_content_type_access($settings) {
-  rules_invoke_event('content_access_content_type');
+  rules_invoke_event('content_access_content_type', $settings);
 }
 
 /**
  * Implements hook_user_acl().
  */
-function content_access_rules_user_acl($settings) {
-  rules_invoke_event('content_access_user_acl');
+function content_access_rules_user_acl($node, $op, $uids_before, $uids) {
+  rules_invoke_event('content_access_user_acl', $node, $op, $uids_before, $uids);
 }
 
 /**
  * Implements hook_per_node().
  */
-function content_access_rules_per_node($settings) {
-  rules_invoke_event('content_access_per_node');
-}
\ No newline at end of file
+function content_access_rules_per_node($node, $settings) {
+  rules_invoke_event('content_access_per_node', $node, $settings);
+}
diff --git a/content_access_rules/content_access_rules.rules.inc b/content_access_rules/content_access_rules.rules.inc
index ae2b902..6321101 100644
--- a/content_access_rules/content_access_rules.rules.inc
+++ b/content_access_rules/content_access_rules.rules.inc
@@ -16,22 +16,53 @@
  * @ingroup rules
  */
 function content_access_rules_rules_event_info() {
+  // @todo This event needs meaningful variables, but what are they?
   $events['content_access_content_type'] = array('label' => t('Content type access control was changed'));
-  $events['content_access_per_node'] = array('label' => t('Per node access control was changed'));
+  $events['content_access_per_node'] = array(
+    'label' => t('Per node access control was changed'),
+    'variables' => array(
+      'node' => array(
+        'label' => t('Node'),
+        'type' => 'node',
+        'skip save' => TRUE,
+      ),
+      'settings' => array(
+        'label' => t('Per-node access control settings'),
+        'type' => 'struct',
+      ),
+    ),
+  );
 
   if (module_exists('acl')) {
-    $events['content_access_user_acl'] = array('label' => t('User was added to ACL'));
+    $events['content_access_user_acl'] = array(
+      'label' => t('ACL saved for node'),
+      'variables' => array(
+        'node' => array(
+          'label' => t('Node'),
+          'type' => 'node',
+          'skip save' => TRUE,
+        ),
+        'op' => array(
+          'label' => t('Operation'),
+          'type' => 'text',
+        ),
+        'uids_before' => array(
+          'label' => t('ACL User IDs before operation'),
+          'type' => 'list<integer>',
+        ),
+        'uids_after' => array(
+          'label' => t('ACL User IDs after operation'),
+          'type' => 'list<integer>',
+        ),
+      ),
+    );
   }
 
-  $items = array();
-  foreach ($events as $name => $event) {
-    $items[$name] = array(
-      'label' => $event['label'],
-      'group' => t('Content Access'),
-    );
+  foreach ($events as &$event) {
+    $event['group'] = t('Content Access');
   }
 
-  return $items;
+  return $events;
 }
 
 /**
@@ -393,4 +424,4 @@ function content_access_action_aquire_grants($node) {
       (isset($node->op) && $node->op != 'Save')) {
     node_access_acquire_grants($node);
   }
-}
\ No newline at end of file
+}