diff --git a/content_access.api.php b/content_access.api.php
new file mode 100644
index 0000000..f1e827b
--- /dev/null
+++ b/content_access.api.php
@@ -0,0 +1,37 @@
+<?php
+
+/**
+ * @file
+ * This file contains no working PHP code; it exists to provide additional
+ * documentation for doxygen as well as to document hooks in the standard
+ * Drupal manner.
+ */
+
+/**
+ * Respond to the creation of an ACL. This hook is invoked after ACL module saves
+ * the information to the database.
+ *
+ * @param $node
+ *   The node to which the ACL applies.
+ * @param string $op
+ *   One of 'view', 'update', 'delete'
+ * @param array $uids_before
+ *   The uids on the ACL for this $op, before the current operation
+ * @param array $uids
+ *   The uids on the ACL for this $op, as saved.
+ */
+function hook_user_acl($node, $op, $uids_before, $uids) {
+  
+}
+
+/**
+ * Respond to the application of per-node content access rules.
+ *
+ * @param $node
+ *   The node to which the rules apply.
+ * @param array $settings
+ *   The keyed array saved by content_access_save_per_node_settings()
+ */
+function hook_per_node($node, $settings) {
+  
+}