diff --git a/ctools.api.php b/ctools.api.php
index 1aef57c..de9edd9 100644
--- a/ctools.api.php
+++ b/ctools.api.php
@@ -203,5 +203,55 @@ function hook_ctools_content_subtype_alter($subtype, $plugin) {
 }
 
 /**
+ * @todo.
+ *
+ * @param array $plugin
+ *   @todo.
+ * @param array $entity
+ *   @todo.
+ * @param string $plugin_id
+ *   @todo.
+ */
+function hook_ctools_entity_context_alter(&$plugin, &$entity, $plugin_id) {
+  // @todo.
+}
+
+/**
+ * @todo.
+ *
+ * @param array $plugins
+ *   @todo.
+ */
+function hook_ctools_entity_contexts_alter(&$plugins) {
+  // @todo.
+}
+
+/**
+ * Change cleanstring settings.
+ *
+ * @param array $settings
+ *   An associative array of cleanstring settings.
+ *
+ * @see ctools_cleanstring()
+ */
+function hook_ctools_cleanstring_alter(&$settings) {
+  // Convert all strings to lower case.
+  $settings['lower case'] = TRUE;
+}
+
+/**
+ * Change cleanstring settings for a specific clean ID.
+ *
+ * @param array $settings
+ *   An associative array of cleanstring settings.
+ *
+ * @see ctools_cleanstring()
+ */
+function hook_ctools_cleanstring_CLEAN_ID_alter(&$settings) {
+  // Convert all strings to lower case.
+  $settings['lower case'] = TRUE;
+}
+
+/**
  * @} End of "addtogroup hooks".
  */
diff --git a/page_manager/page_manager.api.php b/page_manager/page_manager.api.php
new file mode 100644
index 0000000..03e2e75
--- /dev/null
+++ b/page_manager/page_manager.api.php
@@ -0,0 +1,39 @@
+<?php
+
+/**
+ * @file
+ * Describe hooks provided by the Page Manager module.
+ */
+
+/**
+ * @addtogroup hooks
+ * @{
+ */
+
+/**
+ * @todo.
+ *
+ * @param array $result
+ *   @todo.
+ * @param object $page
+ *   @todo.
+ */
+function hook_page_manager_operations_alter(&$result, &$page) {
+  // @todo.
+}
+
+/**
+ * @todo.
+ *
+ * @param array $operations
+ *   @todo.
+ * @param object $handler
+ *   @todo.
+ */
+function hook_page_manager_variant_operations_alter(&$operations, &$handler) {
+  // @todo.
+}
+
+/**
+ * @} End of "addtogroup hooks".
+ */