diff --git a/classes/asset_manager.php b/classes/asset_manager.php
index f5748c2..921563b 100644
--- a/classes/asset_manager.php
+++ b/classes/asset_manager.php
@@ -51,7 +51,9 @@ public function __construct(\file_storage $fs = null) {
     }
 
     /**
-     * @return array
+     * Retrieves a list of assets.
+     *
+     * @return array List of asset objects with name, href, and type.
      */
     public function get_assets() {
         $assets = [];
diff --git a/classes/form/assets_form.php b/classes/form/assets_form.php
index ea05c4a..ce8ff52 100644
--- a/classes/form/assets_form.php
+++ b/classes/form/assets_form.php
@@ -39,7 +39,9 @@
 class assets_form extends \moodleform {
 
     /**
-     * @return array
+     * Retrieves options for the file manager element.
+     *
+     * @return array Array of options for the file manager, including accepted types and subdir settings.
      */
     public static function get_options() {
         global $CFG;
@@ -65,7 +67,9 @@ public static function get_options() {
             'subdirs' => true,
         ];
     }
-
+    /**
+     * Defines the form elements.
+     */
     public function definition() {
         $mform = $this->_form;
 
diff --git a/classes/privacy/provider.php b/classes/privacy/provider.php
index cc1e3c6..b186dc0 100644
--- a/classes/privacy/provider.php
+++ b/classes/privacy/provider.php
@@ -38,7 +38,7 @@ class provider implements \core_privacy\local\metadata\null_provider {
      *
      * @return string
      */
-    public static function get_reason() : string {
+    public static function get_reason(): string {
         return 'privacy:metadata';
     }
 }
diff --git a/lib.php b/lib.php
index 55112a2..d0e0118 100644
--- a/lib.php
+++ b/lib.php
@@ -23,6 +23,18 @@
  * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  */
 
+/**
+ * Handles serving of files for the Theme assets tool.
+ *
+ * @param stdClass $course The course object.
+ * @param stdClass $cm Course module.
+ * @param context $context Context object.
+ * @param string $filearea The file area.
+ * @param array $args Additional arguments.
+ * @param bool $forcedownload Whether or not force download.
+ * @param array $options Additional options affecting file serving.
+ * @return bool False if the file not found or context is incorrect.
+ */
 function tool_themeassets_pluginfile($course, $cm, $context, $filearea, $args, $forcedownload, $options = []) {
     if (!$context instanceof \context_system) {
         return false;
diff --git a/tests/options_test.php b/tests/options_test.php
index 905230d..3ba20da 100644
--- a/tests/options_test.php
+++ b/tests/options_test.php
@@ -34,6 +34,8 @@
 class options_test extends \advanced_testcase {
     /**
      * Test that overriding accepted types omits wildcard file type usage.
+     *
+     * @covers ::test_options_omit_asterisk
      */
     public function test_options_omit_asterisk() {
         global $CFG;